621917197411 has 4 divisors (see below), whose sum is σ = 638725770352. Its totient is φ = 605108624472.

The previous prime is 621917197409. The next prime is 621917197493. The reversal of 621917197411 is 114791719126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621917197411 - 2¹ = 621917197409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621917177411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8404286415 + ... + 8404286488.

It is an arithmetic number, because the mean of its divisors is an integer number (159681442588).

Almost surely, 2^621917197411 is an apocalyptic number.

621917197411 is a deficient number, since it is larger than the sum of its proper divisors (16808572941).

621917197411 is a wasteful number, since it uses less digits than its factorization.

621917197411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16808572940.

The product of its digits is 190512, while the sum is 49.

The spelling of 621917197411 in words is "six hundred twenty-one billion, nine hundred seventeen million, one hundred ninety-seven thousand, four hundred eleven".