11333721 has 16 divisors (see below), whose sum is σ = 17639424. Its totient is φ = 6338064.

The previous prime is 11333717. The next prime is 11333731. The reversal of 11333721 is 12733311.

11333721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11333721 - 2² = 11333717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (11333731) 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, 4755 + ... + 6728.

It is an arithmetic number, because the mean of its divisors is an integer number (1102464).

Almost surely, 2^11333721 is an apocalyptic number.

It is an amenable number.

11333721 is a deficient number, since it is larger than the sum of its proper divisors (6305703).

11333721 is a wasteful number, since it uses less digits than its factorization.

11333721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11540.

The product of its digits is 378, while the sum is 21.

The square root of 11333721 is about 3366.5592227080. The cubic root of 11333721 is about 224.6246977971.

The spelling of 11333721 in words is "eleven million, three hundred thirty-three thousand, seven hundred twenty-one".