21788142346 has 16 divisors (see below), whose sum is σ = 35241413760. Its totient is φ = 10068973920.

The previous prime is 21788142329. The next prime is 21788142353. The reversal of 21788142346 is 64324188712.

It is a junction number, because it is equal to n+sod(n) for n = 21788142296 and 21788142305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6990786 + ... + 6993901.

It is an arithmetic number, because the mean of its divisors is an integer number (2202588360).

Almost surely, 2^21788142346 is an apocalyptic number.

21788142346 is a deficient number, since it is larger than the sum of its proper divisors (13453271414).

21788142346 is a wasteful number, since it uses less digits than its factorization.

21788142346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13984749.

The product of its digits is 516096, while the sum is 46.

The spelling of 21788142346 in words is "twenty-one billion, seven hundred eighty-eight million, one hundred forty-two thousand, three hundred forty-six".