21108382902 has 24 divisors (see below), whose sum is σ = 45999199584. Its totient is φ = 6995455344.

The previous prime is 21108382831. The next prime is 21108382907. The reversal of 21108382902 is 20928380112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21108382907) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3386158 + ... + 3392385.

It is an arithmetic number, because the mean of its divisors is an integer number (1916633316).

Almost surely, 2^21108382902 is an apocalyptic number.

21108382902 is an abundant number, since it is smaller than the sum of its proper divisors (24890816682).

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

21108382902 is a wasteful number, since it uses less digits than its factorization.

21108382902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778724 (or 6778721 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 21108382902 in words is "twenty-one billion, one hundred eight million, three hundred eighty-two thousand, nine hundred two".