21221231033210 has 64 divisors (see below), whose sum is σ = 42274505901600. Its totient is φ = 7619997265920.

The previous prime is 21221231033183. The next prime is 21221231033231. The reversal of 21221231033210 is 1233013212212.

It can be written as a sum of positive squares in 16 ways, for example, as 4071884087881 + 17149346945329 = 2017891^2 + 4141177^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4691885 + ... + 8028464.

Almost surely, 2^{21221231033210} is an apocalyptic number.

21221231033210 is a deficient number, since it is larger than the sum of its proper divisors (21053274868390).

21221231033210 is a wasteful number, since it uses less digits than its factorization.

21221231033210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12720723.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21221231033210 its reverse (1233013212212), we get a palindrome (22454244245422).

The spelling of 21221231033210 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred thirty-one million, thirty-three thousand, two hundred ten".