251471061220 has 24 divisors (see below), whose sum is σ = 528304089600. Its totient is φ = 100547498592.

The previous prime is 251471061211. The next prime is 251471061221. The reversal of 251471061220 is 22160174152.

It is a super-2 number, since 2×251471061220² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251471061221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2507460 + ... + 2605819.

It is an arithmetic number, because the mean of its divisors is an integer number (22012670400).

Almost surely, 2^251471061220 is an apocalyptic number.

251471061220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251471061220 is an abundant number, since it is smaller than the sum of its proper divisors (276833028380).

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

251471061220 is a wasteful number, since it uses less digits than its factorization.

251471061220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115747 (or 5115745 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 251471061220 in words is "two hundred fifty-one billion, four hundred seventy-one million, sixty-one thousand, two hundred twenty".