21952583 has 2 divisors, whose sum is σ = 21952584. Its totient is φ = 21952582.

The previous prime is 21952577. The next prime is 21952591. The reversal of 21952583 is 38525912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21952583 - 2⁶ = 21952519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21952523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10976291 + 10976292.

It is an arithmetic number, because the mean of its divisors is an integer number (10976292).

Almost surely, 2^21952583 is an apocalyptic number.

21952583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21952583 is an equidigital number, since it uses as much as digits as its factorization.

21952583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 21952583 is about 4685.3583640955. The cubic root of 21952583 is about 280.0024787196.

The spelling of 21952583 in words is "twenty-one million, nine hundred fifty-two thousand, five hundred eighty-three".