2501221156 has 24 divisors (see below), whose sum is σ = 5096831040. Its totient is φ = 1051725792.

The previous prime is 2501221141. The next prime is 2501221159. The reversal of 2501221156 is 6511221052.

It is a super-2 number, since 2×2501221156² = 12512214542443952672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2501221156.

It is not an unprimeable number, because it can be changed into a prime (2501221159) 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, 841246 + ... + 844213.

It is an arithmetic number, because the mean of its divisors is an integer number (212367960).

Almost surely, 2^2501221156 is an apocalyptic number.

It is an amenable number.

2501221156 is an abundant number, since it is smaller than the sum of its proper divisors (2595609884).

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

2501221156 is a wasteful number, since it uses less digits than its factorization.

2501221156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685523 (or 1685521 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 2501221156 is about 50012.2100691421. The cubic root of 2501221156 is about 1357.4297541507.

The spelling of 2501221156 in words is "two billion, five hundred one million, two hundred twenty-one thousand, one hundred fifty-six".