21796257 has 8 divisors (see below), whose sum is σ = 33213376. Its totient is φ = 12454992.

The previous prime is 21796253. The next prime is 21796279. The reversal of 21796257 is 75269712.

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

It is not a de Polignac number, because 21796257 - 2² = 21796253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21796253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518938 + ... + 518979.

It is an arithmetic number, because the mean of its divisors is an integer number (4151672).

Almost surely, 2^21796257 is an apocalyptic number.

It is an amenable number.

21796257 is a deficient number, since it is larger than the sum of its proper divisors (11417119).

21796257 is a wasteful number, since it uses less digits than its factorization.

21796257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037927.

The product of its digits is 52920, while the sum is 39.

The square root of 21796257 is about 4668.6461635039. The cubic root of 21796257 is about 279.3362552058.

The spelling of 21796257 in words is "twenty-one million, seven hundred ninety-six thousand, two hundred fifty-seven".