21590773 has 6 divisors (see below), whose sum is σ = 22106454. Its totient is φ = 21086856.

The previous prime is 21590771. The next prime is 21590791. The reversal of 21590773 is 37709512.

It can be written as a sum of positive squares in only one way, i.e., 20775364 + 815409 = 4558^2 + 903^2 .

It is not a de Polignac number, because 21590773 - 2¹ = 21590771 is a prime.

It is a super-2 number, since 2×21590773² = 932322957475058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3990 + ... + 7687.

It is an arithmetic number, because the mean of its divisors is an integer number (3684409).

Almost surely, 2^21590773 is an apocalyptic number.

It is an amenable number.

21590773 is a deficient number, since it is larger than the sum of its proper divisors (515681).

21590773 is an equidigital number, since it uses as much as digits as its factorization.

21590773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11763 (or 11720 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 21590773 is about 4646.5872422672. The cubic root of 21590773 is about 278.4556688686.

The spelling of 21590773 in words is "twenty-one million, five hundred ninety thousand, seven hundred seventy-three".