21868471142 has 8 divisors (see below), whose sum is σ = 37488807696. Its totient is φ = 9372201912.

The previous prime is 21868471129. The next prime is 21868471159. The reversal of 21868471142 is 24117486812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21868471093 and 21868471102.

It is a congruent number.

It is an unprimeable number.

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, 781016813 + ... + 781016840.

It is an arithmetic number, because the mean of its divisors is an integer number (4686100962).

Almost surely, 2^21868471142 is an apocalyptic number.

21868471142 is a deficient number, since it is larger than the sum of its proper divisors (15620336554).

21868471142 is a wasteful number, since it uses less digits than its factorization.

21868471142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562033662.

The product of its digits is 172032, while the sum is 44.

The spelling of 21868471142 in words is "twenty-one billion, eight hundred sixty-eight million, four hundred seventy-one thousand, one hundred forty-two".