21614279 has 4 divisors (see below), whose sum is σ = 21874776. Its totient is φ = 21353784.

The previous prime is 21614261. The next prime is 21614357. The reversal of 21614279 is 97241612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21614279 - 2⁸ = 21614023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614209) 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, 130124 + ... + 130289.

It is an arithmetic number, because the mean of its divisors is an integer number (5468694).

Almost surely, 2^21614279 is an apocalyptic number.

21614279 is a deficient number, since it is larger than the sum of its proper divisors (260497).

21614279 is an equidigital number, since it uses as much as digits as its factorization.

21614279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260496.

The product of its digits is 6048, while the sum is 32.

The square root of 21614279 is about 4649.1159374660. The cubic root of 21614279 is about 278.5566843203.

It can be divided in two parts, 21614 and 279, that multiplied together give a palindrome (6030306).

The spelling of 21614279 in words is "twenty-one million, six hundred fourteen thousand, two hundred seventy-nine".