21590734 has 8 divisors (see below), whose sum is σ = 35330328. Its totient is φ = 9813960.

The previous prime is 21590713. The next prime is 21590741. The reversal of 21590734 is 43709512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21590696 and 21590705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490677 + ... + 490720.

It is an arithmetic number, because the mean of its divisors is an integer number (4416291).

Almost surely, 2^21590734 is an apocalyptic number.

21590734 is a deficient number, since it is larger than the sum of its proper divisors (13739594).

21590734 is a wasteful number, since it uses less digits than its factorization.

21590734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981410.

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

The square root of 21590734 is about 4646.5830456369. The cubic root of 21590734 is about 278.4555012079.

The spelling of 21590734 in words is "twenty-one million, five hundred ninety thousand, seven hundred thirty-four".