21621275123072 has 32 divisors (see below), whose sum is σ = 43075385824320. Its totient is φ = 10810197896704.

The previous prime is 21621275122999. The next prime is 21621275123081. The reversal of 21621275123072 is 27032157212612.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263888 + ... + 6581199.

It is an arithmetic number, because the mean of its divisors is an integer number (1346105807010).

Almost surely, 2^{21621275123072} is an apocalyptic number.

It is an amenable number.

21621275123072 is a deficient number, since it is larger than the sum of its proper divisors (21454110701248).

21621275123072 is an equidigital number, since it uses as much as digits as its factorization.

21621275123072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869778 (or 6869766 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 21621275123072 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-five million, one hundred twenty-three thousand, seventy-two".