21425352874 has 8 divisors (see below), whose sum is σ = 32140296900. Its totient is φ = 10711920576.

The previous prime is 21425352853. The next prime is 21425352881. The reversal of 21425352874 is 47825352412.

It can be written as a sum of positive squares in 2 ways, for example, as 17010680625 + 4414672249 = 130425^2 + 66443^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21425352874.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341809 + ... + 399604.

Almost surely, 2^21425352874 is an apocalyptic number.

21425352874 is a deficient number, since it is larger than the sum of its proper divisors (10714944026).

21425352874 is a wasteful number, since it uses less digits than its factorization.

21425352874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755864.

The product of its digits is 537600, while the sum is 43.

The spelling of 21425352874 in words is "twenty-one billion, four hundred twenty-five million, three hundred fifty-two thousand, eight hundred seventy-four".