21231192 has 32 divisors (see below), whose sum is σ = 54514800. Its totient is φ = 6885504.

The previous prime is 21231173. The next prime is 21231241. The reversal of 21231192 is 29113212.

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, 11067 + ... + 12842.

Almost surely, 2^21231192 is an apocalyptic number.

It is an amenable number.

21231192 is an abundant number, since it is smaller than the sum of its proper divisors (33283608).

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

21231192 is a wasteful number, since it uses less digits than its factorization.

21231192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23955 (or 23951 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 21231192 is about 4607.7317630261. The cubic root of 21231192 is about 276.9011711542.

The spelling of 21231192 in words is "twenty-one million, two hundred thirty-one thousand, one hundred ninety-two".