21676493942 has 4 divisors (see below), whose sum is σ = 32514740916. Its totient is φ = 10838246970.

The previous prime is 21676493939. The next prime is 21676493959. The reversal of 21676493942 is 24939467612.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5419123484 + ... + 5419123487.

It is an arithmetic number, because the mean of its divisors is an integer number (8128685229).

Almost surely, 2^21676493942 is an apocalyptic number.

21676493942 is a deficient number, since it is larger than the sum of its proper divisors (10838246974).

21676493942 is a wasteful number, since it uses less digits than its factorization.

21676493942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10838246973.

The product of its digits is 3919104, while the sum is 53.

The spelling of 21676493942 in words is "twenty-one billion, six hundred seventy-six million, four hundred ninety-three thousand, nine hundred forty-two".