21313352479 has 4 divisors (see below), whose sum is σ = 21314156400. Its totient is φ = 21312548560.

The previous prime is 21313352453. The next prime is 21313352491. The reversal of 21313352479 is 97425331312.

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 21313352479 - 2¹³ = 21313344287 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 (21313352279) 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, 360787 + ... + 415684.

It is an arithmetic number, because the mean of its divisors is an integer number (5328539100).

Almost surely, 2^21313352479 is an apocalyptic number.

21313352479 is a deficient number, since it is larger than the sum of its proper divisors (803921).

21313352479 is an equidigital number, since it uses as much as digits as its factorization.

21313352479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803920.

The product of its digits is 136080, while the sum is 40.

The spelling of 21313352479 in words is "twenty-one billion, three hundred thirteen million, three hundred fifty-two thousand, four hundred seventy-nine".