21621224006404 has 12 divisors (see below), whose sum is σ = 41276882194128. Its totient is φ = 9827829093800.

The previous prime is 21621224006381. The next prime is 21621224006419. The reversal of 21621224006404 is 40460042212612.

It is a super-2 number, since 2×21621224006404² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21621224006404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245695727302 + ... + 245695727389.

It is an arithmetic number, because the mean of its divisors is an integer number (3439740182844).

Almost surely, 2^{21621224006404} is an apocalyptic number.

It is an amenable number.

21621224006404 is a deficient number, since it is larger than the sum of its proper divisors (19655658187724).

21621224006404 is a wasteful number, since it uses less digits than its factorization.

21621224006404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491391454706 (or 491391454704 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The spelling of 21621224006404 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-four million, six thousand, four hundred four".