621161121 has 32 divisors (see below), whose sum is σ = 991641600. Its totient is φ = 338345280.

The previous prime is 621161117. The next prime is 621161137. The reversal of 621161121 is 121161126.

It is not a de Polignac number, because 621161121 - 2² = 621161117 is a prime.

It is a super-2 number, since 2×621161121² = 771682276483953282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (621161141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41656 + ... + 54566.

It is an arithmetic number, because the mean of its divisors is an integer number (30988800).

Almost surely, 2^621161121 is an apocalyptic number.

It is an amenable number.

621161121 is a deficient number, since it is larger than the sum of its proper divisors (370480479).

621161121 is a wasteful number, since it uses less digits than its factorization.

621161121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13029.

The product of its digits is 144, while the sum is 21.

The square root of 621161121 is about 24923.1041605977. The cubic root of 621161121 is about 853.2338728717.

The spelling of 621161121 in words is "six hundred twenty-one million, one hundred sixty-one thousand, one hundred twenty-one".