21621520022 has 32 divisors (see below), whose sum is σ = 35215557600. Its totient is φ = 9921305088.

The previous prime is 21621520009. The next prime is 21621520043. The reversal of 21621520022 is 22002512612.

It is a self number, because there is not a number n which added to its sum of digits gives 21621520022.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 288398 + ... + 355550.

It is an arithmetic number, because the mean of its divisors is an integer number (1100486175).

Almost surely, 2^21621520022 is an apocalyptic number.

21621520022 is a deficient number, since it is larger than the sum of its proper divisors (13594037578).

21621520022 is a wasteful number, since it uses less digits than its factorization.

21621520022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67440.

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 21621520022 in words is "twenty-one billion, six hundred twenty-one million, five hundred twenty thousand, twenty-two".