21272477657180 has 24 divisors (see below), whose sum is σ = 47023371664080. Its totient is φ = 8061149427840.

The previous prime is 21272477657177. The next prime is 21272477657191. The reversal of 21272477657180 is 8175677427212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27990101801 + ... + 27990102560.

It is an arithmetic number, because the mean of its divisors is an integer number (1959307152670).

Almost surely, 2^{21272477657180} is an apocalyptic number.

21272477657180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21272477657180 is an abundant number, since it is smaller than the sum of its proper divisors (25750894006900).

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

21272477657180 is a wasteful number, since it uses less digits than its factorization.

21272477657180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55980204389 (or 55980204387 counting only the distinct ones).

The product of its (nonzero) digits is 18439680, while the sum is 59.

The spelling of 21272477657180 in words is "twenty-one trillion, two hundred seventy-two billion, four hundred seventy-seven million, six hundred fifty-seven thousand, one hundred eighty".