21590049 has 8 divisors (see below), whose sum is σ = 31001152. Its totient is φ = 13286160.

The previous prime is 21590039. The next prime is 21590059. The reversal of 21590049 is 94009512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21590039) and next prime (21590059).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21590049 - 2⁸ = 21589793 is a prime.

It is a super-2 number, since 2×21590049² = 932260431644802, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21589998 and 21590025.

It is not an unprimeable number, because it can be changed into a prime (21590039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276757 + ... + 276834.

It is an arithmetic number, because the mean of its divisors is an integer number (3875144).

Almost surely, 2^21590049 is an apocalyptic number.

It is an amenable number.

21590049 is a deficient number, since it is larger than the sum of its proper divisors (9411103).

21590049 is a wasteful number, since it uses less digits than its factorization.

21590049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553607.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21590049 is about 4646.5093349739. The cubic root of 21590049 is about 278.4525563638.

The spelling of 21590049 in words is "twenty-one million, five hundred ninety thousand, forty-nine".