102200012021 has 4 divisors (see below), whose sum is σ = 108211777452. Its totient is φ = 96188246592.

The previous prime is 102200012003. The next prime is 102200012023. The reversal of 102200012021 is 120210002201.

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 74441119921 + 27758892100 = 272839^2 + 166610^2 .

It is a cyclic number.

It is not a de Polignac number, because 102200012021 - 2¹⁸ = 102199749877 is a prime.

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 = 102200011993 and 102200012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102200012023) 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, 3005882690 + ... + 3005882723.

It is an arithmetic number, because the mean of its divisors is an integer number (27052944363).

Almost surely, 2^102200012021 is an apocalyptic number.

It is an amenable number.

102200012021 is a deficient number, since it is larger than the sum of its proper divisors (6011765431).

102200012021 is an equidigital number, since it uses as much as digits as its factorization.

102200012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011765430.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102200012021 its reverse (120210002201), we get a palindrome (222410014222).

The spelling of 102200012021 in words is "one hundred two billion, two hundred million, twelve thousand, twenty-one".