21348638942 has 8 divisors (see below), whose sum is σ = 32565720600. Its totient is φ = 10493398744.

The previous prime is 21348638933. The next prime is 21348638959. The reversal of 21348638942 is 24983684312.

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

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, 90460217 + ... + 90460452.

It is an arithmetic number, because the mean of its divisors is an integer number (4070715075).

Almost surely, 2^21348638942 is an apocalyptic number.

21348638942 is a deficient number, since it is larger than the sum of its proper divisors (11217081658).

21348638942 is a wasteful number, since it uses less digits than its factorization.

21348638942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180920730.

The product of its digits is 1990656, while the sum is 50.

The spelling of 21348638942 in words is "twenty-one billion, three hundred forty-eight million, six hundred thirty-eight thousand, nine hundred forty-two".