21102202210 has 16 divisors (see below), whose sum is σ = 38006220600. Its totient is φ = 8435934976.

The previous prime is 21102202171. The next prime is 21102202211. The reversal of 21102202210 is 1220220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7726585801 + 13375616409 = 87901^2 + 115653^2 .

It is a super-2 number, since 2×21102202210² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21102202211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600295 + ... + 634474.

Almost surely, 2^21102202210 is an apocalyptic number.

21102202210 is a deficient number, since it is larger than the sum of its proper divisors (16904018390).

21102202210 is a wasteful number, since it uses less digits than its factorization.

21102202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236485.

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

Adding to 21102202210 its reverse (1220220112), we get a palindrome (22322422322).

The spelling of 21102202210 in words is "twenty-one billion, one hundred two million, two hundred two thousand, two hundred ten".