21110987754 has 48 divisors (see below), whose sum is σ = 45894101760. Its totient is φ = 7013407680.

The previous prime is 21110987731. The next prime is 21110987767. The reversal of 21110987754 is 45778901112.

It is a happy number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8313417 + ... + 8315955.

It is an arithmetic number, because the mean of its divisors is an integer number (956127120).

Almost surely, 2^21110987754 is an apocalyptic number.

21110987754 is an abundant number, since it is smaller than the sum of its proper divisors (24783114006).

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

21110987754 is a wasteful number, since it uses less digits than its factorization.

21110987754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3912 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 21110987754 in words is "twenty-one billion, one hundred ten million, nine hundred eighty-seven thousand, seven hundred fifty-four".