11221872 has 40 divisors (see below), whose sum is σ = 29112720. Its totient is φ = 3724800.

The previous prime is 11221843. The next prime is 11221883. The reversal of 11221872 is 27812211.

It is a super-2 number, since 2×11221872² = 251860822368768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18372 + ... + 18972.

It is an arithmetic number, because the mean of its divisors is an integer number (727818).

Almost surely, 2^11221872 is an apocalyptic number.

11221872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221872 is an abundant number, since it is smaller than the sum of its proper divisors (17890848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11221872 is a wasteful number, since it uses less digits than its factorization.

11221872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 995 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 11221872 is about 3349.9062673454. The cubic root of 11221872 is about 223.8833363587.

The spelling of 11221872 in words is "eleven million, two hundred twenty-one thousand, eight hundred seventy-two".