21048422579 has 4 divisors (see below), whose sum is σ = 21049853040. Its totient is φ = 21046992120.

The previous prime is 21048422567. The next prime is 21048422621. The reversal of 21048422579 is 97522484012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21048422579 is a prime.

It is a super-2 number, since 2×21048422579² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21048422539) 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, 692927 + ... + 722664.

It is an arithmetic number, because the mean of its divisors is an integer number (5262463260).

Almost surely, 2^21048422579 is an apocalyptic number.

21048422579 is a deficient number, since it is larger than the sum of its proper divisors (1430461).

21048422579 is a wasteful number, since it uses less digits than its factorization.

21048422579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430460.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 21048422579 in words is "twenty-one billion, forty-eight million, four hundred twenty-two thousand, five hundred seventy-nine".