21590063 has 8 divisors (see below), whose sum is σ = 23787216. Its totient is φ = 19432000.

The previous prime is 21590059. The next prime is 21590087. The reversal of 21590063 is 36009512.

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

It is a cyclic number.

It is not a de Polignac number, because 21590063 - 2² = 21590059 is a prime.

It is a super-2 number, since 2×21590063² = 932261640687938, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590263) 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, 8606 + ... + 10827.

It is an arithmetic number, because the mean of its divisors is an integer number (2973402).

Almost surely, 2^21590063 is an apocalyptic number.

21590063 is a deficient number, since it is larger than the sum of its proper divisors (2197153).

21590063 is a wasteful number, since it uses less digits than its factorization.

21590063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19545.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 21590063 is about 4646.5108414809. The cubic root of 21590063 is about 278.4526165510.

Adding to 21590063 its reverse (36009512), we get a palindrome (57599575).

The spelling of 21590063 in words is "twenty-one million, five hundred ninety thousand, sixty-three".