21161621182 has 32 divisors (see below), whose sum is σ = 37077826464. Its totient is φ = 8968166400.

The previous prime is 21161621179. The next prime is 21161621207. The reversal of 21161621182 is 28112616112.

It is a super-2 number, since 2×21161621182² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565744 + ... + 601987.

It is an arithmetic number, because the mean of its divisors is an integer number (1158682077).

Almost surely, 2^21161621182 is an apocalyptic number.

21161621182 is a deficient number, since it is larger than the sum of its proper divisors (15916205282).

21161621182 is a wasteful number, since it uses less digits than its factorization.

21161621182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167804.

The product of its digits is 2304, while the sum is 31.

The spelling of 21161621182 in words is "twenty-one billion, one hundred sixty-one million, six hundred twenty-one thousand, one hundred eighty-two".