21425136477724 has 24 divisors (see below), whose sum is σ = 42850393818848. Its totient is φ = 9182175448320.

The previous prime is 21425136477629. The next prime is 21425136477761. The reversal of 21425136477724 is 42777463152412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11665864 + ... + 13376944.

Almost surely, 2^{21425136477724} is an apocalyptic number.

It is an amenable number.

21425136477724 is an abundant number, since it is smaller than the sum of its proper divisors (21425257341124).

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

21425136477724 is a wasteful number, since it uses less digits than its factorization.

21425136477724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158285 (or 2158283 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 55.

The spelling of 21425136477724 in words is "twenty-one trillion, four hundred twenty-five billion, one hundred thirty-six million, four hundred seventy-seven thousand, seven hundred twenty-four".