11612233721 has 32 divisors (see below), whose sum is σ = 13575969792. Its totient is φ = 9826407360.

The previous prime is 11612233709. The next prime is 11612233751. The reversal of 11612233721 is 12733221611.

It is not a de Polignac number, because 11612233721 - 2⁶ = 11612233657 is a prime.

It is a super-2 number, since 2×11612233721² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11612233751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3185726 + ... + 3189368.

It is an arithmetic number, because the mean of its divisors is an integer number (424249056).

Almost surely, 2^11612233721 is an apocalyptic number.

11612233721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11612233721 is a deficient number, since it is larger than the sum of its proper divisors (1963736071).

11612233721 is a wasteful number, since it uses less digits than its factorization.

11612233721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013.

The product of its digits is 3024, while the sum is 29.

The spelling of 11612233721 in words is "eleven billion, six hundred twelve million, two hundred thirty-three thousand, seven hundred twenty-one".