21163155021043 has 16 divisors (see below), whose sum is σ = 24279246561024. Its totient is φ = 18070358896800.

The previous prime is 21163155021031. The next prime is 21163155021053. The reversal of 21163155021043 is 34012055136112.

It is not a de Polignac number, because 21163155021043 - 2⁹ = 21163155020531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21163155021053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1592080 + ... + 6697837.

It is an arithmetic number, because the mean of its divisors is an integer number (1517452910064).

Almost surely, 2^{21163155021043} is an apocalyptic number.

21163155021043 is a deficient number, since it is larger than the sum of its proper divisors (3116091539981).

21163155021043 is a wasteful number, since it uses less digits than its factorization.

21163155021043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8291322.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 21163155021043 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred fifty-five million, twenty-one thousand, forty-three".