11739031921 has 16 divisors (see below), whose sum is σ = 12126365440. Its totient is φ = 11355603840.

The previous prime is 11739031903. The next prime is 11739031987. The reversal of 11739031921 is 12913093711.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11739031921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11739031021) 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, 5145301 + ... + 5147581.

It is an arithmetic number, because the mean of its divisors is an integer number (757897840).

Almost surely, 2^11739031921 is an apocalyptic number.

It is an amenable number.

11739031921 is a deficient number, since it is larger than the sum of its proper divisors (387333519).

11739031921 is a wasteful number, since it uses less digits than its factorization.

11739031921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064.

The product of its (nonzero) digits is 10206, while the sum is 37.

The spelling of 11739031921 in words is "eleven billion, seven hundred thirty-nine million, thirty-one thousand, nine hundred twenty-one".