21424804621018 has 32 divisors (see below), whose sum is σ = 33721018657920. Its totient is φ = 10196080440000.

The previous prime is 21424804620959. The next prime is 21424804621027. The reversal of 21424804621018 is 81012640842412.

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, 8189773 + ... + 10484368.

It is an arithmetic number, because the mean of its divisors is an integer number (1053781833060).

Almost surely, 2^{21424804621018} is an apocalyptic number.

21424804621018 is a deficient number, since it is larger than the sum of its proper divisors (12296214036902).

21424804621018 is a wasteful number, since it uses less digits than its factorization.

21424804621018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18674454.

The product of its (nonzero) digits is 196608, while the sum is 43.

The spelling of 21424804621018 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred twenty-one thousand, eighteen".