21221202122010 has 96 divisors (see below), whose sum is σ = 61089420030912. Its totient is φ = 5067749744640.

The previous prime is 21221202121927. The next prime is 21221202122047. The reversal of 21221202122010 is 1022120212212.

It is a happy number.

21221202122010 is a `hidden beast` number, since 21 + 221 + 202 + 1 + 220 + 1 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 159900519 + ... + 160033178.

It is an arithmetic number, because the mean of its divisors is an integer number (636348125322).

Almost surely, 2^{21221202122010} is an apocalyptic number.

21221202122010 is an abundant number, since it is smaller than the sum of its proper divisors (39868217908902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221202122010 is a wasteful number, since it uses less digits than its factorization.

21221202122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319933788 (or 319933785 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221202122010 its reverse (1022120212212), we get a palindrome (22243322334222).

The spelling of 21221202122010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-two thousand, ten".