21249425493 has 16 divisors (see below), whose sum is σ = 31924022400. Its totient is φ = 13966757280.

The previous prime is 21249425473. The next prime is 21249425501. The reversal of 21249425493 is 39452494212.

21249425493 is a `hidden beast` number, since 2 + 12 + 4 + 94 + 2 + 549 + 3 = 666.

It is not a de Polignac number, because 21249425493 - 2⁸ = 21249425237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21249425423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5540448 + ... + 5544281.

It is an arithmetic number, because the mean of its divisors is an integer number (1995251400).

Almost surely, 2^21249425493 is an apocalyptic number.

It is an amenable number.

21249425493 is a deficient number, since it is larger than the sum of its proper divisors (10674596907).

21249425493 is a wasteful number, since it uses less digits than its factorization.

21249425493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11084809 (or 11084803 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 21249425493 in words is "twenty-one billion, two hundred forty-nine million, four hundred twenty-five thousand, four hundred ninety-three".