21305262479 has 8 divisors (see below), whose sum is σ = 21835464960. Its totient is φ = 20778264216.

The previous prime is 21305262469. The next prime is 21305262481. The reversal of 21305262479 is 97426250312.

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

It is not a de Polignac number, because 21305262479 - 2⁴ = 21305262463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305262469) 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, 787589 + ... + 814190.

It is an arithmetic number, because the mean of its divisors is an integer number (2729433120).

Almost surely, 2^21305262479 is an apocalyptic number.

21305262479 is a deficient number, since it is larger than the sum of its proper divisors (530202481).

21305262479 is a wasteful number, since it uses less digits than its factorization.

21305262479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602109.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 21305262479 in words is "twenty-one billion, three hundred five million, two hundred sixty-two thousand, four hundred seventy-nine".