621266366460221 has 12 divisors (see below), whose sum is σ = 662470515544992. Its totient is φ = 582498011156928.

The previous prime is 621266366460197. The next prime is 621266366460239. The reversal of 621266366460221 is 122064663662126.

It is not a de Polignac number, because 621266366460221 - 2³⁰ = 621265292718397 is a prime.

It is a super-2 number, since 2×621266366460221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621266366460821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4086826295 + ... + 4086978308.

It is an arithmetic number, because the mean of its divisors is an integer number (55205876295416).

Almost surely, 2^{621266366460221} is an apocalyptic number.

It is an amenable number.

621266366460221 is a deficient number, since it is larger than the sum of its proper divisors (41204149084771).

621266366460221 is a wasteful number, since it uses less digits than its factorization.

621266366460221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8173804900 (or 8173804883 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 53.

The spelling of 621266366460221 in words is "six hundred twenty-one trillion, two hundred sixty-six billion, three hundred sixty-six million, four hundred sixty thousand, two hundred twenty-one".