21485739180 has 48 divisors (see below), whose sum is σ = 60170987520. Its totient is φ = 5728490688.

The previous prime is 21485739173. The next prime is 21485739203. The reversal of 21485739180 is 8193758412.

It is a super-2 number, since 2×21485739180² (a number of 21 digits) contains 22 as substring.

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, 335287 + ... + 394193.

It is an arithmetic number, because the mean of its divisors is an integer number (1253562240).

Almost surely, 2^21485739180 is an apocalyptic number.

21485739180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21485739180 is an abundant number, since it is smaller than the sum of its proper divisors (38685248340).

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

21485739180 is a wasteful number, since it uses less digits than its factorization.

21485739180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64998 (or 64996 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 21485739180 in words is "twenty-one billion, four hundred eighty-five million, seven hundred thirty-nine thousand, one hundred eighty".