21285425426 has 4 divisors (see below), whose sum is σ = 31928138142. Its totient is φ = 10642712712.

The previous prime is 21285425401. The next prime is 21285425489. The reversal of 21285425426 is 62452458212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18576327025 + 2709098401 = 136295^2 + 52049^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5321356355 + ... + 5321356358.

Almost surely, 2^21285425426 is an apocalyptic number.

21285425426 is a deficient number, since it is larger than the sum of its proper divisors (10642712716).

21285425426 is a wasteful number, since it uses less digits than its factorization.

21285425426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10642712715.

The product of its digits is 307200, while the sum is 41.

The spelling of 21285425426 in words is "twenty-one billion, two hundred eighty-five million, four hundred twenty-five thousand, four hundred twenty-six".