21154225352 has 32 divisors (see below), whose sum is σ = 42836343480. Its totient is φ = 9735813120.

The previous prime is 21154225333. The next prime is 21154225361. The reversal of 21154225352 is 25352245112.

It can be written as a sum of positive squares in 4 ways, for example, as 12689121316 + 8465104036 = 112646^2 + 92006^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251399 + ... + 324822.

Almost surely, 2^21154225352 is an apocalyptic number.

It is an amenable number.

21154225352 is an abundant number, since it is smaller than the sum of its proper divisors (21682118128).

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

21154225352 is a wasteful number, since it uses less digits than its factorization.

21154225352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576593 (or 576589 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The spelling of 21154225352 in words is "twenty-one billion, one hundred fifty-four million, two hundred twenty-five thousand, three hundred fifty-two".