21893071 has 4 divisors (see below), whose sum is σ = 22264200. Its totient is φ = 21521944.

The previous prime is 21893051. The next prime is 21893077. The reversal of 21893071 is 17039812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21893071 is a prime.

It is a super-2 number, since 2×21893071² = 958613115622082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185476 + ... + 185593.

It is an arithmetic number, because the mean of its divisors is an integer number (5566050).

Almost surely, 2^21893071 is an apocalyptic number.

21893071 is a deficient number, since it is larger than the sum of its proper divisors (371129).

21893071 is an equidigital number, since it uses as much as digits as its factorization.

21893071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371128.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 21893071 is about 4679.0032058121. The cubic root of 21893071 is about 279.7492270009.

The spelling of 21893071 in words is "twenty-one million, eight hundred ninety-three thousand, seventy-one".