21896401 has 2 divisors, whose sum is σ = 21896402. Its totient is φ = 21896400.

The previous prime is 21896393. The next prime is 21896411. The reversal of 21896401 is 10469812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17230801 + 4665600 = 4151^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 21896401 - 2³ = 21896393 is a prime.

It is not a weakly prime, because it can be changed into another prime (21896411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10948200 + 10948201.

It is an arithmetic number, because the mean of its divisors is an integer number (10948201).

Almost surely, 2^21896401 is an apocalyptic number.

It is an amenable number.

21896401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21896401 is an equidigital number, since it uses as much as digits as its factorization.

21896401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21896401 is about 4679.3590373041. The cubic root of 21896401 is about 279.7634098398.

The spelling of 21896401 in words is "twenty-one million, eight hundred ninety-six thousand, four hundred one".