102000022210021 has 4 divisors (see below), whose sum is σ = 109846177764652. Its totient is φ = 94153866655392.

The previous prime is 102000022210013. The next prime is 102000022210043. The reversal of 102000022210021 is 120012220000201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24535626689025 + 77464395520996 = 4953345^2 + 8801386^2 .

It is a cyclic number.

It is not a de Polignac number, because 102000022210021 - 2³ = 102000022210013 is a prime.

It is a super-4 number, since 4×102000022210021⁴ (a number of 57 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 7846155554617 = 102000022210021 / (1 + 0 + 2 + 0 + 0 + 0 + 0 + 2 + 2 + 2 + 1 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102000022209983 and 102000022210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102000022210081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3923077777296 + ... + 3923077777321.

It is an arithmetic number, because the mean of its divisors is an integer number (27461544441163).

Almost surely, 2^{102000022210021} is an apocalyptic number.

It is an amenable number.

102000022210021 is a deficient number, since it is larger than the sum of its proper divisors (7846155554631).

102000022210021 is an equidigital number, since it uses as much as digits as its factorization.

102000022210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7846155554630.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102000022210021 its reverse (120012220000201), we get a palindrome (222012242210222).

The spelling of 102000022210021 in words is "one hundred two trillion, twenty-two million, two hundred ten thousand, twenty-one".