621954065848321 has 8 divisors (see below), whose sum is σ = 623303764199424. Its totient is φ = 620604395019840.

The previous prime is 621954065848253. The next prime is 621954065848369. The reversal of 621954065848321 is 123848560459126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621954065848321 - 2¹⁵ = 621954065815553 is a prime.

It is a super-2 number, since 2×621954065848321² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621954065840321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38691360 + ... + 52353886.

It is an arithmetic number, because the mean of its divisors is an integer number (77912970524928).

Almost surely, 2^{621954065848321} is an apocalyptic number.

It is an amenable number.

621954065848321 is a deficient number, since it is larger than the sum of its proper divisors (1349698351103).

621954065848321 is a wasteful number, since it uses less digits than its factorization.

621954065848321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761311.

The product of its (nonzero) digits is 99532800, while the sum is 64.

The spelling of 621954065848321 in words is "six hundred twenty-one trillion, nine hundred fifty-four billion, sixty-five million, eight hundred forty-eight thousand, three hundred twenty-one".