2161437232040 has 32 divisors (see below), whose sum is σ = 4865000541480. Its totient is φ = 864260800512.

The previous prime is 2161437231991. The next prime is 2161437232091. The reversal of 2161437232040 is 402327341612.

It can be written as a sum of positive squares in 4 ways, for example, as 1600786709284 + 560650522756 = 1265222^2 + 748766^2 .

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, 9703889 + ... + 9924128.

Almost surely, 2^{2161437232040} is an apocalyptic number.

2161437232040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161437232040 is an abundant number, since it is smaller than the sum of its proper divisors (2703563309440).

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

2161437232040 is a wasteful number, since it uses less digits than its factorization.

2161437232040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19630781 (or 19630777 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 2161437232040 in words is "two trillion, one hundred sixty-one billion, four hundred thirty-seven million, two hundred thirty-two thousand, forty".