21102021000202 has 4 divisors (see below), whose sum is σ = 31653031500306. Its totient is φ = 10551010500100.

The previous prime is 21102021000197. The next prime is 21102021000251. The reversal of 21102021000202 is 20200012020112.

It is a happy number.

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., 19606289554201 + 1495731446001 = 4427899^2 + 1223001^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275505250049 + ... + 5275505250052.

Almost surely, 2^{21102021000202} is an apocalyptic number.

21102021000202 is a deficient number, since it is larger than the sum of its proper divisors (10551010500104).

21102021000202 is a wasteful number, since it uses less digits than its factorization.

21102021000202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10551010500103.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21102021000202 its reverse (20200012020112), we get a palindrome (41302033020314).

The spelling of 21102021000202 in words is "twenty-one trillion, one hundred two billion, twenty-one million, two hundred two", and thus it is an aban number.