21154425354 has 48 divisors (see below), whose sum is σ = 49714446600. Its totient is φ = 6474808320.

The previous prime is 21154425349. The next prime is 21154425359. The reversal of 21154425354 is 45352445112.

21154425354 is a `hidden beast` number, since 2 + 11 + 544 + 2 + 53 + 54 = 666.

It is an interprime number because it is at equal distance from previous prime (21154425349) and next prime (21154425359).

It can be written as a sum of positive squares in 4 ways, for example, as 12639380625 + 8515044729 = 112425^2 + 92277^2 .

It is not an unprimeable number, because it can be changed into a prime (21154425359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 830529 + ... + 855620.

Almost surely, 2^21154425354 is an apocalyptic number.

21154425354 is an abundant number, since it is smaller than the sum of its proper divisors (28560021246).

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

21154425354 is a wasteful number, since it uses less digits than its factorization.

21154425354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686215 (or 1686212 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 21154425354 in words is "twenty-one billion, one hundred fifty-four million, four hundred twenty-five thousand, three hundred fifty-four".