21938240375 has 16 divisors (see below), whose sum is σ = 27644755008. Its totient is φ = 17380188000.

The previous prime is 21938240347. The next prime is 21938240377. The reversal of 21938240375 is 57304283912.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21938240375 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938240377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839096 + ... + 864845.

It is an arithmetic number, because the mean of its divisors is an integer number (1727797188).

Almost surely, 2^21938240375 is an apocalyptic number.

21938240375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21938240375 is a deficient number, since it is larger than the sum of its proper divisors (5706514633).

21938240375 is a wasteful number, since it uses less digits than its factorization.

21938240375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704059 (or 1704049 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 21938240375 in words is "twenty-one billion, nine hundred thirty-eight million, two hundred forty thousand, three hundred seventy-five".