102121200021 has 32 divisors (see below), whose sum is σ = 148455272448. Its totient is φ = 62181043200.

The previous prime is 102121200017. The next prime is 102121200037. The reversal of 102121200021 is 120002121201.

It is not a de Polignac number, because 102121200021 - 2² = 102121200017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121200011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 652071 + ... + 793371.

It is an arithmetic number, because the mean of its divisors is an integer number (4639227264).

Almost surely, 2^102121200021 is an apocalyptic number.

It is an amenable number.

102121200021 is a deficient number, since it is larger than the sum of its proper divisors (46334072427).

102121200021 is a wasteful number, since it uses less digits than its factorization.

102121200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141741.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102121200021 its reverse (120002121201), we get a palindrome (222123321222).

The spelling of 102121200021 in words is "one hundred two billion, one hundred twenty-one million, two hundred thousand, twenty-one".