21822453 has 10 divisors (see below), whose sum is σ = 32599094. Its totient is φ = 14548248.

The previous prime is 21822439. The next prime is 21822461. The reversal of 21822453 is 35422812.

It can be written as a sum of positive squares in only one way, i.e., 21734244 + 88209 = 4662^2 + 297^2 .

It is not a de Polignac number, because 21822453 - 2⁵ = 21822421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 134626 + ... + 134787.

Almost surely, 2^21822453 is an apocalyptic number.

It is an amenable number.

21822453 is a deficient number, since it is larger than the sum of its proper divisors (10776641).

21822453 is an equidigital number, since it uses as much as digits as its factorization.

21822453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269425 (or 269416 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21822453 is about 4671.4508452942. The cubic root of 21822453 is about 279.4481178828.

The spelling of 21822453 in words is "twenty-one million, eight hundred twenty-two thousand, four hundred fifty-three".