21012100111202 has 4 divisors (see below), whose sum is σ = 31518150166806. Its totient is φ = 10506050055600.

The previous prime is 21012100111201. The next prime is 21012100111259. The reversal of 21012100111202 is 20211100121012.

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

It can be written as a sum of positive squares in only one way, i.e., 19833118926721 + 1178981184481 = 4453439^2 + 1085809^2 .

It is not an unprimeable number, because it can be changed into a prime (21012100111201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253025027799 + ... + 5253025027802.

Almost surely, 2^{21012100111202} is an apocalyptic number.

21012100111202 is a deficient number, since it is larger than the sum of its proper divisors (10506050055604).

21012100111202 is a wasteful number, since it uses less digits than its factorization.

21012100111202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506050055603.

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

Adding to 21012100111202 its reverse (20211100121012), we get a palindrome (41223200232214).

The spelling of 21012100111202 in words is "twenty-one trillion, twelve billion, one hundred million, one hundred eleven thousand, two hundred two".