21192902 has 8 divisors (see below), whose sum is σ = 32814912. Its totient is φ = 10254600.

The previous prime is 21192893. The next prime is 21192929. The reversal of 21192902 is 20929112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent 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, 170849 + ... + 170972.

It is an arithmetic number, because the mean of its divisors is an integer number (4101864).

Almost surely, 2^21192902 is an apocalyptic number.

21192902 is a deficient number, since it is larger than the sum of its proper divisors (11622010).

21192902 is a wasteful number, since it uses less digits than its factorization.

21192902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341854.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21192902 is about 4603.5749152153. The cubic root of 21192902 is about 276.7346092067.

The spelling of 21192902 in words is "twenty-one million, one hundred ninety-two thousand, nine hundred two".