21110101988 has 24 divisors (see below), whose sum is σ = 37122883392. Its totient is φ = 10503608544.

The previous prime is 21110101963. The next prime is 21110101993. The reversal of 21110101988 is 88910101112.

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 7 ways as a sum of consecutive naturals, for example, 2617370 + ... + 2625422.

It is an arithmetic number, because the mean of its divisors is an integer number (1546786808).

Almost surely, 2^21110101988 is an apocalyptic number.

It is an amenable number.

21110101988 is a deficient number, since it is larger than the sum of its proper divisors (16012781404).

21110101988 is a wasteful number, since it uses less digits than its factorization.

21110101988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11171 (or 11169 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

The spelling of 21110101988 in words is "twenty-one billion, one hundred ten million, one hundred one thousand, nine hundred eighty-eight".