21114591 has 8 divisors (see below), whose sum is σ = 28807680. Its totient is φ = 13748952.

The previous prime is 21114589. The next prime is 21114607. The reversal of 21114591 is 19541112.

It is a happy number.

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

It is not a de Polignac number, because 21114591 - 2¹ = 21114589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114521) 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, 81711 + ... + 81968.

It is an arithmetic number, because the mean of its divisors is an integer number (3600960).

Almost surely, 2^21114591 is an apocalyptic number.

21114591 is a deficient number, since it is larger than the sum of its proper divisors (7693089).

21114591 is a wasteful number, since it uses less digits than its factorization.

21114591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163725.

The product of its digits is 360, while the sum is 24.

The square root of 21114591 is about 4595.0615882706. The cubic root of 21114591 is about 276.3933296609.

The spelling of 21114591 in words is "twenty-one million, one hundred fourteen thousand, five hundred ninety-one".