11775731421 has 16 divisors (see below), whose sum is σ = 16041110400. Its totient is φ = 7682239488.

The previous prime is 11775731399. The next prime is 11775731431. The reversal of 11775731421 is 12413757711.

It is not a de Polignac number, because 11775731421 - 2¹³ = 11775723229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11775731421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11775731431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201441 + ... + 253238.

It is an arithmetic number, because the mean of its divisors is an integer number (1002569400).

Almost surely, 2^11775731421 is an apocalyptic number.

It is an amenable number.

11775731421 is a deficient number, since it is larger than the sum of its proper divisors (4265378979).

11775731421 is an equidigital number, since it uses as much as digits as its factorization.

11775731421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454868.

The product of its digits is 41160, while the sum is 39.

The spelling of 11775731421 in words is "eleven billion, seven hundred seventy-five million, seven hundred thirty-one thousand, four hundred twenty-one".