21192692 has 6 divisors (see below), whose sum is σ = 37087218. Its totient is φ = 10596344.

The previous prime is 21192671. The next prime is 21192709. The reversal of 21192692 is 29629112.

It can be written as a sum of positive squares in only one way, i.e., 15413476 + 5779216 = 3926^2 + 2404^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2649083 + ... + 2649090.

It is an arithmetic number, because the mean of its divisors is an integer number (6181203).

Almost surely, 2^21192692 is an apocalyptic number.

It is an amenable number.

21192692 is a deficient number, since it is larger than the sum of its proper divisors (15894526).

21192692 is a wasteful number, since it uses less digits than its factorization.

21192692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5298177 (or 5298175 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 21192692 is about 4603.5521067975. The cubic root of 21192692 is about 276.7336951513.

The spelling of 21192692 in words is "twenty-one million, one hundred ninety-two thousand, six hundred ninety-two".