21201136388 has 24 divisors (see below), whose sum is σ = 37532608512. Its totient is φ = 10478047104.

The previous prime is 21201136387. The next prime is 21201136391. The reversal of 21201136388 is 88363110212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21201136387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101981 + ... + 229787.

It is an arithmetic number, because the mean of its divisors is an integer number (1563858688).

Almost surely, 2^21201136388 is an apocalyptic number.

It is an amenable number.

21201136388 is a deficient number, since it is larger than the sum of its proper divisors (16331472124).

21201136388 is a wasteful number, since it uses less digits than its factorization.

21201136388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128291 (or 128289 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 21201136388 in words is "twenty-one billion, two hundred one million, one hundred thirty-six thousand, three hundred eighty-eight".