11921072739 has 8 divisors (see below), whose sum is σ = 16731330240. Its totient is φ = 7529098536.

The previous prime is 11921072719. The next prime is 11921072749. The reversal of 11921072739 is 93727012911.

It is a happy number.

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

It is not a de Polignac number, because 11921072739 - 2⁸ = 11921072483 is a prime.

It is a super-2 number, since 2×11921072739² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11921072739.

It is not an unprimeable number, because it can be changed into a prime (11921072719) 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, 104570757 + ... + 104570870.

It is an arithmetic number, because the mean of its divisors is an integer number (2091416280).

Almost surely, 2^11921072739 is an apocalyptic number.

11921072739 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11921072739 is a deficient number, since it is larger than the sum of its proper divisors (4810257501).

11921072739 is a wasteful number, since it uses less digits than its factorization.

11921072739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209141649.

The product of its (nonzero) digits is 47628, while the sum is 42.

The spelling of 11921072739 in words is "eleven billion, nine hundred twenty-one million, seventy-two thousand, seven hundred thirty-nine".