21420263959 has 8 divisors (see below), whose sum is σ = 23162839488. Its totient is φ = 19731306240.

The previous prime is 21420263951. The next prime is 21420263987. The reversal of 21420263959 is 95936202412.

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

It is a cyclic number.

It is not a de Polignac number, because 21420263959 - 2³ = 21420263951 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 (21420263951) 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, 13403622 + ... + 13405219.

It is an arithmetic number, because the mean of its divisors is an integer number (2895354936).

Almost surely, 2^21420263959 is an apocalyptic number.

21420263959 is a deficient number, since it is larger than the sum of its proper divisors (1742575529).

21420263959 is a wasteful number, since it uses less digits than its factorization.

21420263959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26808905.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 21420263959 in words is "twenty-one billion, four hundred twenty million, two hundred sixty-three thousand, nine hundred fifty-nine".