21102202010 has 16 divisors (see below), whose sum is σ = 38225902536. Its totient is φ = 8387116608.

The previous prime is 21102202007. The next prime is 21102202073. The reversal of 21102202010 is 1020220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18413675809 + 2688526201 = 135697^2 + 51851^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102201982 and 21102202000.

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, 6718877 + ... + 6722016.

Almost surely, 2^21102202010 is an apocalyptic number.

21102202010 is a deficient number, since it is larger than the sum of its proper divisors (17123700526).

21102202010 is a wasteful number, since it uses less digits than its factorization.

21102202010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13441057.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21102202010 its reverse (1020220112), we get a palindrome (22122422122).

The spelling of 21102202010 in words is "twenty-one billion, one hundred two million, two hundred two thousand, ten".