21101229984 has 24 divisors (see below), whose sum is σ = 55390728960. Its totient is φ = 7033743296.

The previous prime is 21101229979. The next prime is 21101230013. The reversal of 21101229984 is 48992210112.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109902144 + ... + 109902335.

It is an arithmetic number, because the mean of its divisors is an integer number (2307947040).

Almost surely, 2^21101229984 is an apocalyptic number.

21101229984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21101229984 is an abundant number, since it is smaller than the sum of its proper divisors (34289498976).

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

21101229984 is a wasteful number, since it uses less digits than its factorization.

21101229984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219804492 (or 219804484 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The spelling of 21101229984 in words is "twenty-one billion, one hundred one million, two hundred twenty-nine thousand, nine hundred eighty-four".