21525245154 has 64 divisors (see below), whose sum is σ = 54693561600. Its totient is φ = 6147114624.

The previous prime is 21525245101. The next prime is 21525245173. The reversal of 21525245154 is 45154252512.

21525245154 is a `hidden beast` number, since 2 + 152 + 5 + 2 + 451 + 54 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 845134 + ... + 870230.

It is an arithmetic number, because the mean of its divisors is an integer number (854586900).

Almost surely, 2^21525245154 is an apocalyptic number.

21525245154 is an abundant number, since it is smaller than the sum of its proper divisors (33168316446).

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

21525245154 is a wasteful number, since it uses less digits than its factorization.

21525245154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27384 (or 27378 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

Adding to 21525245154 its reverse (45154252512), we get a palindrome (66679497666).

The spelling of 21525245154 in words is "twenty-one billion, five hundred twenty-five million, two hundred forty-five thousand, one hundred fifty-four".