21222542815825 has 36 divisors (see below), whose sum is σ = 29995761033840. Its totient is φ = 14847187792320.

The previous prime is 21222542815709. The next prime is 21222542815847. The reversal of 21222542815825 is 52851824522212.

It is not a de Polignac number, because 21222542815825 - 2²⁹ = 21222005944913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 132106227 + ... + 132266776.

Almost surely, 2^{21222542815825} is an apocalyptic number.

21222542815825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21222542815825 is a deficient number, since it is larger than the sum of its proper divisors (8773218218015).

21222542815825 is a wasteful number, since it uses less digits than its factorization.

21222542815825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264373058 (or 264373040 counting only the distinct ones).

The product of its digits is 2048000, while the sum is 49.

The spelling of 21222542815825 in words is "twenty-one trillion, two hundred twenty-two billion, five hundred forty-two million, eight hundred fifteen thousand, eight hundred twenty-five".