21429714879 has 24 divisors (see below), whose sum is σ = 31581267120. Its totient is φ = 13997722752.

The previous prime is 21429714877. The next prime is 21429714899. The reversal of 21429714879 is 97841792412.

21429714879 is a `hidden beast` number, since 2 + 1 + 429 + 7 + 148 + 79 = 666.

It is not a de Polignac number, because 21429714879 - 2¹ = 21429714877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21429714877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322107 + ... + 382899.

It is an arithmetic number, because the mean of its divisors is an integer number (1315886130).

Almost surely, 2^21429714879 is an apocalyptic number.

21429714879 is a deficient number, since it is larger than the sum of its proper divisors (10151552241).

21429714879 is a wasteful number, since it uses less digits than its factorization.

21429714879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61591 (or 61588 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 21429714879 in words is "twenty-one billion, four hundred twenty-nine million, seven hundred fourteen thousand, eight hundred seventy-nine".