21992593 has 8 divisors (see below), whose sum is σ = 25437888. Its totient is φ = 18623184.

The previous prime is 21992587. The next prime is 21992599. The reversal of 21992593 is 39529912.

It is an interprime number because it is at equal distance from previous prime (21992587) and next prime (21992599).

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 21992593 - 2⁵ = 21992561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21992599) 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, 18346 + ... + 19507.

It is an arithmetic number, because the mean of its divisors is an integer number (3179736).

Almost surely, 2^21992593 is an apocalyptic number.

It is an amenable number.

21992593 is a deficient number, since it is larger than the sum of its proper divisors (3445295).

21992593 is an equidigital number, since it uses as much as digits as its factorization.

21992593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37943.

The product of its digits is 43740, while the sum is 40.

The square root of 21992593 is about 4689.6261044992. The cubic root of 21992593 is about 280.1724830125.

The spelling of 21992593 in words is "twenty-one million, nine hundred ninety-two thousand, five hundred ninety-three".