21923273 has 2 divisors, whose sum is σ = 21923274. Its totient is φ = 21923272.

The previous prime is 21923269. The next prime is 21923299. The reversal of 21923273 is 37232912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15147664 + 6775609 = 3892^2 + 2603^2 .

It is a cyclic number.

It is not a de Polignac number, because 21923273 - 2² = 21923269 is a prime.

It is not a weakly prime, because it can be changed into another prime (21923173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10961636 + 10961637.

It is an arithmetic number, because the mean of its divisors is an integer number (10961637).

Almost surely, 2^21923273 is an apocalyptic number.

It is an amenable number.

21923273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21923273 is an equidigital number, since it uses as much as digits as its factorization.

21923273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 29.

The square root of 21923273 is about 4682.2294903176. The cubic root of 21923273 is about 279.8778080778.

The spelling of 21923273 in words is "twenty-one million, nine hundred twenty-three thousand, two hundred seventy-three".