21796351 has 2 divisors, whose sum is σ = 21796352. Its totient is φ = 21796350.

The previous prime is 21796343. The next prime is 21796393. The reversal of 21796351 is 15369712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21796351 - 2³ = 21796343 is a prime.

It is equal to p_1377178 and since 21796351 and 1377178 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21796321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898175 + 10898176.

It is an arithmetic number, because the mean of its divisors is an integer number (10898176).

Almost surely, 2^21796351 is an apocalyptic number.

21796351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796351 is an equidigital number, since it uses as much as digits as its factorization.

21796351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 21796351 is about 4668.6562306514. The cubic root of 21796351 is about 279.3366567667.

The spelling of 21796351 in words is "twenty-one million, seven hundred ninety-six thousand, three hundred fifty-one".