21430015279 has 4 divisors (see below), whose sum is σ = 22557910840. Its totient is φ = 20302119720.

The previous prime is 21430015273. The next prime is 21430015301. The reversal of 21430015279 is 97251003412.

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 21430015279 - 2¹³ = 21430007087 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 (21430015273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563947752 + ... + 563947789.

It is an arithmetic number, because the mean of its divisors is an integer number (5639477710).

Almost surely, 2^21430015279 is an apocalyptic number.

21430015279 is a deficient number, since it is larger than the sum of its proper divisors (1127895561).

21430015279 is a wasteful number, since it uses less digits than its factorization.

21430015279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127895560.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21430015279 in words is "twenty-one billion, four hundred thirty million, fifteen thousand, two hundred seventy-nine".