21592273 has 2 divisors, whose sum is σ = 21592274. Its totient is φ = 21592272.

The previous prime is 21592271. The next prime is 21592283. The reversal of 21592273 is 37229512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 173889 = 4628^2 + 417^2 .

It is a cyclic number.

It is not a de Polignac number, because 21592273 - 2¹ = 21592271 is a prime.

Together with 21592271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21592271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10796136 + 10796137.

It is an arithmetic number, because the mean of its divisors is an integer number (10796137).

Almost surely, 2^21592273 is an apocalyptic number.

It is an amenable number.

21592273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21592273 is an equidigital number, since it uses as much as digits as its factorization.

21592273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 21592273 is about 4646.7486482486. The cubic root of 21592273 is about 278.4621172070.

The spelling of 21592273 in words is "twenty-one million, five hundred ninety-two thousand, two hundred seventy-three".