2159507139021 has 12 divisors (see below), whose sum is σ = 3120593808540. Its totient is φ = 1439068786560.

The previous prime is 2159507138993. The next prime is 2159507139059. The reversal of 2159507139021 is 1209317059512.

2159507139021 is a `hidden beast` number, since 2 + 1 + 5 + 9 + 507 + 139 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 298427301225 + 1861079837796 = 546285^2 + 1364214^2 .

It is not a de Polignac number, because 2159507139021 - 2¹³ = 2159507130829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159507139061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50197260 + ... + 50240261.

It is an arithmetic number, because the mean of its divisors is an integer number (260049484045).

Almost surely, 2^{2159507139021} is an apocalyptic number.

It is an amenable number.

2159507139021 is a deficient number, since it is larger than the sum of its proper divisors (961086669519).

2159507139021 is a wasteful number, since it uses less digits than its factorization.

2159507139021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100439916 (or 100439913 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 45.

The spelling of 2159507139021 in words is "two trillion, one hundred fifty-nine billion, five hundred seven million, one hundred thirty-nine thousand, twenty-one".