102110210021 has 16 divisors (see below), whose sum is σ = 104768769600. Its totient is φ = 99464951040.

The previous prime is 102110210011. The next prime is 102110210023. The reversal of 102110210021 is 120012011201.

It is a cyclic number.

It is not a de Polignac number, because 102110210021 - 2¹⁰ = 102110208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102110209984 and 102110210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102110210023) 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, 40057655 + ... + 40060203.

It is an arithmetic number, because the mean of its divisors is an integer number (6548048100).

Almost surely, 2^102110210021 is an apocalyptic number.

It is an amenable number.

102110210021 is a deficient number, since it is larger than the sum of its proper divisors (2658559579).

102110210021 is a wasteful number, since it uses less digits than its factorization.

102110210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102110210021 its reverse (120012011201), we get a palindrome (222122221222).

The spelling of 102110210021 in words is "one hundred two billion, one hundred ten million, two hundred ten thousand, twenty-one".