21110110938 has 48 divisors (see below), whose sum is σ = 52902472896. Its totient is φ = 5958789120.

The previous prime is 21110110913. The next prime is 21110110939. The reversal of 21110110938 is 83901101112.

It is not an unprimeable number, because it can be changed into a prime (21110110939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 998823 + ... + 1019738.

It is an arithmetic number, because the mean of its divisors is an integer number (1102134852).

Almost surely, 2^21110110938 is an apocalyptic number.

21110110938 is an abundant number, since it is smaller than the sum of its proper divisors (31792361958).

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

21110110938 is a wasteful number, since it uses less digits than its factorization.

21110110938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018659 (or 2018656 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The spelling of 21110110938 in words is "twenty-one billion, one hundred ten million, one hundred ten thousand, nine hundred thirty-eight".