21012202010 has 32 divisors (see below), whose sum is σ = 39388842000. Its totient is φ = 8060577280.

The previous prime is 21012202007. The next prime is 21012202067. The reversal of 21012202010 is 1020221012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 987404929 + 20024797081 = 31423^2 + 141509^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21012201982 and 21012202000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199931 + ... + 286350.

Almost surely, 2^21012202010 is an apocalyptic number.

21012202010 is a deficient number, since it is larger than the sum of its proper divisors (18376639990).

21012202010 is a wasteful number, since it uses less digits than its factorization.

21012202010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486466.

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

Adding to 21012202010 its reverse (1020221012), we get a palindrome (22032423022).

The spelling of 21012202010 in words is "twenty-one billion, twelve million, two hundred two thousand, ten".