21477731060 has 24 divisors (see below), whose sum is σ = 45867699360. Its totient is φ = 8445480224.

The previous prime is 21477731053. The next prime is 21477731071. The reversal of 21477731060 is 6013777412.

It is a super-2 number, since 2×21477731060² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9099554 + ... + 9101913.

It is an arithmetic number, because the mean of its divisors is an integer number (1911154140).

Almost surely, 2^21477731060 is an apocalyptic number.

21477731060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21477731060 is an abundant number, since it is smaller than the sum of its proper divisors (24389968300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21477731060 is a wasteful number, since it uses less digits than its factorization.

21477731060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201535 (or 18201533 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 38.

The spelling of 21477731060 in words is "twenty-one billion, four hundred seventy-seven million, seven hundred thirty-one thousand, sixty".