21621224565412 has 12 divisors (see below), whose sum is σ = 37838676830976. Its totient is φ = 10810174042280.

The previous prime is 21621224565383. The next prime is 21621224565503. The reversal of 21621224565412 is 21456542212612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109449088 + ... + 109646455.

It is an arithmetic number, because the mean of its divisors is an integer number (3153223069248).

Almost surely, 2^{21621224565412} is an apocalyptic number.

It is an amenable number.

21621224565412 is a deficient number, since it is larger than the sum of its proper divisors (16217452265564).

21621224565412 is a wasteful number, since it uses less digits than its factorization.

21621224565412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219120218 (or 219120216 counting only the distinct ones).

The product of its digits is 460800, while the sum is 43.

The spelling of 21621224565412 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-four million, five hundred sixty-five thousand, four hundred twelve".