21614477 has 4 divisors (see below), whose sum is σ = 21734076. Its totient is φ = 21494880.

The previous prime is 21614441. The next prime is 21614491. The reversal of 21614477 is 77441612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8444836 + 13169641 = 2906^2 + 3629^2 .

It is a cyclic number.

It is not a de Polignac number, because 21614477 - 2⁸ = 21614221 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 (21616477) 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, 59528 + ... + 59889.

It is an arithmetic number, because the mean of its divisors is an integer number (5433519).

Almost surely, 2^21614477 is an apocalyptic number.

It is an amenable number.

21614477 is a deficient number, since it is larger than the sum of its proper divisors (119599).

21614477 is a wasteful number, since it uses less digits than its factorization.

21614477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119598.

The product of its digits is 9408, while the sum is 32.

The square root of 21614477 is about 4649.1372317883. The cubic root of 21614477 is about 278.5575349008.

The spelling of 21614477 in words is "twenty-one million, six hundred fourteen thousand, four hundred seventy-seven".