21850453 has 2 divisors, whose sum is σ = 21850454. Its totient is φ = 21850452.

The previous prime is 21850429. The next prime is 21850489. The reversal of 21850453 is 35405812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 2331729 = 4418^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 21850453 - 2⁹ = 21849941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21850853) 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 as a sum of consecutive naturals, namely, 10925226 + 10925227.

It is an arithmetic number, because the mean of its divisors is an integer number (10925227).

Almost surely, 2^21850453 is an apocalyptic number.

It is an amenable number.

21850453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21850453 is an equidigital number, since it uses as much as digits as its factorization.

21850453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 21850453 is about 4674.4468121907. The cubic root of 21850453 is about 279.5675850996.

The spelling of 21850453 in words is "twenty-one million, eight hundred fifty thousand, four hundred fifty-three".