102100202121021 has 16 divisors (see below), whose sum is σ = 155229266574144. Its totient is φ = 59134958694144.

The previous prime is 102100202120989. The next prime is 102100202121031. The reversal of 102100202121021 is 120121202001201.

It is not a de Polignac number, because 102100202121021 - 2⁵ = 102100202120989 is a prime.

It is a super-2 number, since 2×102100202121021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102100202121031) 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, 76998643471 + ... + 76998644796.

It is an arithmetic number, because the mean of its divisors is an integer number (9701829160884).

Almost surely, 2^{102100202121021} is an apocalyptic number.

It is an amenable number.

102100202121021 is a deficient number, since it is larger than the sum of its proper divisors (53129064453123).

102100202121021 is a wasteful number, since it uses less digits than its factorization.

102100202121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153997288300.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 102100202121021 its reverse (120121202001201), we get a palindrome (222221404122222).

The spelling of 102100202121021 in words is "one hundred two trillion, one hundred billion, two hundred two million, one hundred twenty-one thousand, twenty-one".