21941479 has 4 divisors (see below), whose sum is σ = 25075984. Its totient is φ = 18806976.

The previous prime is 21941461. The next prime is 21941489. The reversal of 21941479 is 97414912.

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 21941479 - 2⁷ = 21941351 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 (21941449) 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, 1567242 + ... + 1567255.

It is an arithmetic number, because the mean of its divisors is an integer number (6268996).

Almost surely, 2^21941479 is an apocalyptic number.

21941479 is a deficient number, since it is larger than the sum of its proper divisors (3134505).

21941479 is an equidigital number, since it uses as much as digits as its factorization.

21941479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134504.

The product of its digits is 18144, while the sum is 37.

The square root of 21941479 is about 4684.1732461556. The cubic root of 21941479 is about 279.9552607089.

The spelling of 21941479 in words is "twenty-one million, nine hundred forty-one thousand, four hundred seventy-nine".