2155221560 has 16 divisors (see below), whose sum is σ = 4849248600. Its totient is φ = 862088608.

The previous prime is 2155221517. The next prime is 2155221577. The reversal of 2155221560 is 651225512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26940230 + ... + 26940309.

Almost surely, 2^2155221560 is an apocalyptic number.

2155221560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155221560 is an abundant number, since it is smaller than the sum of its proper divisors (2694027040).

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

2155221560 is a wasteful number, since it uses less digits than its factorization.

2155221560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53880550 (or 53880546 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 2155221560 is about 46424.3638620929. The cubic root of 2155221560 is about 1291.7068845935.

The spelling of 2155221560 in words is "two billion, one hundred fifty-five million, two hundred twenty-one thousand, five hundred sixty".