21900838438 has 8 divisors (see below), whose sum is σ = 34783684632. Its totient is φ = 10306276896.

The previous prime is 21900838417. The next prime is 21900838447. The reversal of 21900838438 is 83483800912.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322071120 + ... + 322071187.

It is an arithmetic number, because the mean of its divisors is an integer number (4347960579).

Almost surely, 2^21900838438 is an apocalyptic number.

21900838438 is a deficient number, since it is larger than the sum of its proper divisors (12882846194).

21900838438 is a wasteful number, since it uses less digits than its factorization.

21900838438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644142326.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 21900838438 in words is "twenty-one billion, nine hundred million, eight hundred thirty-eight thousand, four hundred thirty-eight".