21020102100212 has 24 divisors (see below), whose sum is σ = 37487978728200. Its totient is φ = 10309343522816.

The previous prime is 21020102100199. The next prime is 21020102100223. The reversal of 21020102100212 is 21200120102012.

It can be written as a sum of positive squares in 4 ways, for example, as 17262412897636 + 3757689202576 = 4154806^2 + 1938476^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10649537 + ... + 12468072.

It is an arithmetic number, because the mean of its divisors is an integer number (1561999113675).

Almost surely, 2^{21020102100212} is an apocalyptic number.

It is an amenable number.

21020102100212 is a deficient number, since it is larger than the sum of its proper divisors (16467876627988).

21020102100212 is a wasteful number, since it uses less digits than its factorization.

21020102100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23121955 (or 23121953 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020102100212 its reverse (21200120102012), we get a palindrome (42220222202224).

The spelling of 21020102100212 in words is "twenty-one trillion, twenty billion, one hundred two million, one hundred thousand, two hundred twelve".