21022121312 has 24 divisors (see below), whose sum is σ = 41390986392. Its totient is φ = 10510124800.

The previous prime is 21022121299. The next prime is 21022121321. The reversal of 21022121312 is 21312122012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463487 + ... + 506817.

It is an arithmetic number, because the mean of its divisors is an integer number (1724624433).

Almost surely, 2^21022121312 is an apocalyptic number.

It is an amenable number.

21022121312 is a deficient number, since it is larger than the sum of its proper divisors (20368865080).

21022121312 is a wasteful number, since it uses less digits than its factorization.

21022121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58502 (or 58494 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21022121312 its reverse (21312122012), we get a palindrome (42334243324).

The spelling of 21022121312 in words is "twenty-one billion, twenty-two million, one hundred twenty-one thousand, three hundred twelve".