102121022021 has 4 divisors (see below), whose sum is σ = 102348463500. Its totient is φ = 101893580544.

The previous prime is 102121022011. The next prime is 102121022023. The reversal of 102121022021 is 120220121201.

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 42967485796 + 59153536225 = 207286^2 + 243215^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121022021 - 2²² = 102116827717 is a prime.

It is a super-2 number, since 2×102121022021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102121021987 and 102121022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121022023) 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, 113720066 + ... + 113720963.

It is an arithmetic number, because the mean of its divisors is an integer number (25587115875).

Almost surely, 2^102121022021 is an apocalyptic number.

It is an amenable number.

102121022021 is a deficient number, since it is larger than the sum of its proper divisors (227441479).

102121022021 is an equidigital number, since it uses as much as digits as its factorization.

102121022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227441478.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102121022021 its reverse (120220121201), we get a palindrome (222341143222).

The spelling of 102121022021 in words is "one hundred two billion, one hundred twenty-one million, twenty-two thousand, twenty-one".