21221192 has 16 divisors (see below), whose sum is σ = 40104960. Its totient is φ = 10526544.

The previous prime is 21221171. The next prime is 21221237. The reversal of 21221192 is 29112212.

It is a happy number.

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, 9428 + ... + 11459.

It is an arithmetic number, because the mean of its divisors is an integer number (2506560).

Almost surely, 2^21221192 is an apocalyptic number.

It is an amenable number.

21221192 is a deficient number, since it is larger than the sum of its proper divisors (18883768).

21221192 is a wasteful number, since it uses less digits than its factorization.

21221192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21020 (or 21016 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 21221192 is about 4606.6465026090. The cubic root of 21221192 is about 276.8576903711.

The spelling of 21221192 in words is "twenty-one million, two hundred twenty-one thousand, one hundred ninety-two".