21121192 has 16 divisors (see below), whose sum is σ = 39657600. Its totient is φ = 10545840.

The previous prime is 21121187. The next prime is 21121201. The reversal of 21121192 is 29112112.

It is a happy number.

It is a super-2 number, since 2×21121192² = 892209503001728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6409 + ... + 9127.

It is an arithmetic number, because the mean of its divisors is an integer number (2478600).

Almost surely, 2^21121192 is an apocalyptic number.

It is an amenable number.

21121192 is a deficient number, since it is larger than the sum of its proper divisors (18536408).

21121192 is a wasteful number, since it uses less digits than its factorization.

21121192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696 (or 3692 counting only the distinct ones).

The product of its digits is 72, while the sum is 19.

The square root of 21121192 is about 4595.7798032543. The cubic root of 21121192 is about 276.4221293706.

The spelling of 21121192 in words is "twenty-one million, one hundred twenty-one thousand, one hundred ninety-two".