102920010021 has 16 divisors (see below), whose sum is σ = 152513531520. Its totient is φ = 68595590880.

The previous prime is 102920009999. The next prime is 102920010031. The reversal of 102920010021 is 120010029201.

It is not a de Polignac number, because 102920010021 - 2⁹ = 102920009509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102920009976 and 102920010003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102920010031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386305 + ... + 595878.

It is an arithmetic number, because the mean of its divisors is an integer number (9532095720).

Almost surely, 2^102920010021 is an apocalyptic number.

It is an amenable number.

102920010021 is a deficient number, since it is larger than the sum of its proper divisors (49593521499).

102920010021 is an equidigital number, since it uses as much as digits as its factorization.

102920010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986073 (or 986067 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 102920010021 its reverse (120010029201), we get a palindrome (222930039222).

The spelling of 102920010021 in words is "one hundred two billion, nine hundred twenty million, ten thousand, twenty-one".