11974847021 has 4 divisors (see below), whose sum is σ = 11975082912. Its totient is φ = 11974611132.

The previous prime is 11974846991. The next prime is 11974847023. The reversal of 11974847021 is 12074847911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11974847021 - 2²² = 11970652717 is a prime.

It is a super-2 number, since 2×11974847021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11974847023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7031 + ... + 154916.

It is an arithmetic number, because the mean of its divisors is an integer number (2993770728).

Almost surely, 2^11974847021 is an apocalyptic number.

It is an amenable number.

11974847021 is a deficient number, since it is larger than the sum of its proper divisors (235891).

11974847021 is an equidigital number, since it uses as much as digits as its factorization.

11974847021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235890.

The product of its (nonzero) digits is 112896, while the sum is 44.

The spelling of 11974847021 in words is "eleven billion, nine hundred seventy-four million, eight hundred forty-seven thousand, twenty-one".