21120010100102 has 4 divisors (see below), whose sum is σ = 31680015150156. Its totient is φ = 10560005050050.

The previous prime is 21120010100099. The next prime is 21120010100191. The reversal of 21120010100102 is 20100101002112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280002525024 + ... + 5280002525027.

It is an arithmetic number, because the mean of its divisors is an integer number (7920003787539).

Almost surely, 2^{21120010100102} is an apocalyptic number.

21120010100102 is a deficient number, since it is larger than the sum of its proper divisors (10560005050054).

21120010100102 is a wasteful number, since it uses less digits than its factorization.

21120010100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560005050053.

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

Adding to 21120010100102 its reverse (20100101002112), we get a palindrome (41220111102214).

The spelling of 21120010100102 in words is "twenty-one trillion, one hundred twenty billion, ten million, one hundred thousand, one hundred two".