21249875693 has 8 divisors (see below), whose sum is σ = 21364608000. Its totient is φ = 21135334608.

The previous prime is 21249875659. The next prime is 21249875701. The reversal of 21249875693 is 39657894212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21249875693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21249875653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177908 + ... + 272306.

It is an arithmetic number, because the mean of its divisors is an integer number (2670576000).

Almost surely, 2^21249875693 is an apocalyptic number.

It is an amenable number.

21249875693 is a deficient number, since it is larger than the sum of its proper divisors (114732307).

21249875693 is an equidigital number, since it uses as much as digits as its factorization.

21249875693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95611.

The product of its digits is 6531840, while the sum is 56.

The spelling of 21249875693 in words is "twenty-one billion, two hundred forty-nine million, eight hundred seventy-five thousand, six hundred ninety-three".