21942618438 has 32 divisors (see below), whose sum is σ = 47267412192. Its totient is φ = 6750662400.

The previous prime is 21942618427. The next prime is 21942618443. The reversal of 21942618438 is 83481624912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770778 + ... + 798738.

It is an arithmetic number, because the mean of its divisors is an integer number (1477106631).

Almost surely, 2^21942618438 is an apocalyptic number.

21942618438 is an abundant number, since it is smaller than the sum of its proper divisors (25324793754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21942618438 is a wasteful number, since it uses less digits than its factorization.

21942618438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38040.

The product of its digits is 663552, while the sum is 48.

The spelling of 21942618438 in words is "twenty-one billion, nine hundred forty-two million, six hundred eighteen thousand, four hundred thirty-eight".