21892201 has 2 divisors, whose sum is σ = 21892202. Its totient is φ = 21892200.

The previous prime is 21892153. The next prime is 21892207. The reversal of 21892201 is 10229812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21864976 + 27225 = 4676^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21892201 - 2⁹ = 21891689 is a prime.

It is not a weakly prime, because it can be changed into another prime (21892207) 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 as a sum of consecutive naturals, namely, 10946100 + 10946101.

It is an arithmetic number, because the mean of its divisors is an integer number (10946101).

Almost surely, 2^21892201 is an apocalyptic number.

It is an amenable number.

21892201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21892201 is an equidigital number, since it uses as much as digits as its factorization.

21892201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21892201 is about 4678.9102363691. The cubic root of 21892201 is about 279.7455213376.

The spelling of 21892201 in words is "twenty-one million, eight hundred ninety-two thousand, two hundred one".