21400593 has 8 divisors (see below), whose sum is σ = 30036000. Its totient is φ = 13516128.

The previous prime is 21400591. The next prime is 21400597. The reversal of 21400593 is 39500412.

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

It is not a de Polignac number, because 21400593 - 2¹ = 21400591 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21400591) 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, 187668 + ... + 187781.

It is an arithmetic number, because the mean of its divisors is an integer number (3754500).

Almost surely, 2^21400593 is an apocalyptic number.

It is an amenable number.

21400593 is a deficient number, since it is larger than the sum of its proper divisors (8635407).

21400593 is a wasteful number, since it uses less digits than its factorization.

21400593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375471.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21400593 is about 4626.0774961083. The cubic root of 21400593 is about 277.6356742613.

The spelling of 21400593 in words is "twenty-one million, four hundred thousand, five hundred ninety-three".