102100102112021 has 4 divisors (see below), whose sum is σ = 109953956120652. Its totient is φ = 94246248103392.

The previous prime is 102100102111951. The next prime is 102100102112053. The reversal of 102100102112021 is 120211201001201.

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 18679078924900 + 83421023187121 = 4321930^2 + 9133511^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100102112021 - 2¹⁸ = 102100101849877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102100102111987 and 102100102112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102100102162021) 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, 3926927004296 + ... + 3926927004321.

It is an arithmetic number, because the mean of its divisors is an integer number (27488489030163).

Almost surely, 2^{102100102112021} is an apocalyptic number.

It is an amenable number.

102100102112021 is a deficient number, since it is larger than the sum of its proper divisors (7853854008631).

102100102112021 is an equidigital number, since it uses as much as digits as its factorization.

102100102112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7853854008630.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102100102112021 its reverse (120211201001201), we get a palindrome (222311303113222).

The spelling of 102100102112021 in words is "one hundred two trillion, one hundred billion, one hundred two million, one hundred twelve thousand, twenty-one".