621660620211 has 16 divisors (see below), whose sum is σ = 840464958624. Its totient is φ = 408651450624.

The previous prime is 621660620201. The next prime is 621660620233. The reversal of 621660620211 is 112026066126.

It is not a de Polignac number, because 621660620211 - 2¹⁴ = 621660603827 is a prime.

It is a super-2 number, since 2×621660620211² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621660620201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419265 + ... + 1191261.

It is an arithmetic number, because the mean of its divisors is an integer number (52529059914).

Almost surely, 2^621660620211 is an apocalyptic number.

621660620211 is a deficient number, since it is larger than the sum of its proper divisors (218804338413).

621660620211 is a wasteful number, since it uses less digits than its factorization.

621660620211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775750.

The product of its (nonzero) digits is 10368, while the sum is 33.

Adding to 621660620211 its reverse (112026066126), we get a palindrome (733686686337).

The spelling of 621660620211 in words is "six hundred twenty-one billion, six hundred sixty million, six hundred twenty thousand, two hundred eleven".