21792351 has 16 divisors (see below), whose sum is σ = 35161344. Its totient is φ = 11720064.

The previous prime is 21792347. The next prime is 21792359. The reversal of 21792351 is 15329712.

It is not a de Polignac number, because 21792351 - 2² = 21792347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792359) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30165 + ... + 30878.

It is an arithmetic number, because the mean of its divisors is an integer number (2197584).

Almost surely, 2^21792351 is an apocalyptic number.

21792351 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21792351 is a deficient number, since it is larger than the sum of its proper divisors (13368993).

21792351 is a wasteful number, since it uses less digits than its factorization.

21792351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61070.

The product of its digits is 3780, while the sum is 30.

The square root of 21792351 is about 4668.2278222041. The cubic root of 21792351 is about 279.3195680502.

The spelling of 21792351 in words is "twenty-one million, seven hundred ninety-two thousand, three hundred fifty-one".