11921904761 has 16 divisors (see below), whose sum is σ = 13059574080. Its totient is φ = 10817323200.

The previous prime is 11921904733. The next prime is 11921904769. The reversal of 11921904761 is 16740912911.

It is a cyclic number.

It is not a de Polignac number, because 11921904761 - 2⁶ = 11921904697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11921904769) 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, 149846 + ... + 215168.

It is an arithmetic number, because the mean of its divisors is an integer number (816223380).

Almost surely, 2^11921904761 is an apocalyptic number.

It is an amenable number.

11921904761 is a deficient number, since it is larger than the sum of its proper divisors (1137669319).

11921904761 is a wasteful number, since it uses less digits than its factorization.

11921904761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65576.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 11921904761 in words is "eleven billion, nine hundred twenty-one million, nine hundred four thousand, seven hundred sixty-one".