21621334062576 has 40 divisors (see below), whose sum is σ = 56562139751680. Its totient is φ = 7115882095296.

The previous prime is 21621334062541. The next prime is 21621334062589. The reversal of 21621334062576 is 67526043312612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2850910510 + ... + 2850918093.

It is an arithmetic number, because the mean of its divisors is an integer number (1414053493792).

Almost surely, 2^{21621334062576} is an apocalyptic number.

It is an amenable number.

21621334062576 is an abundant number, since it is smaller than the sum of its proper divisors (34940805689104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21621334062576 is a wasteful number, since it uses less digits than its factorization.

21621334062576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701828693 (or 5701828687 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 21621334062576 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred thirty-four million, sixty-two thousand, five hundred seventy-six".