21152211165154 has 32 divisors (see below), whose sum is σ = 33381516341376. Its totient is φ = 10039011857280.

The previous prime is 21152211165143. The next prime is 21152211165181. The reversal of 21152211165154 is 45156111225112.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153824859 + ... + 153962305.

It is an arithmetic number, because the mean of its divisors is an integer number (1043172385668).

Almost surely, 2^{21152211165154} is an apocalyptic number.

21152211165154 is a deficient number, since it is larger than the sum of its proper divisors (12229305176222).

21152211165154 is a wasteful number, since it uses less digits than its factorization.

21152211165154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188250.

The product of its digits is 24000, while the sum is 37.

The spelling of 21152211165154 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred eleven million, one hundred sixty-five thousand, one hundred fifty-four".