21100010984 has 24 divisors (see below), whose sum is σ = 42839891910. Its totient is φ = 9738465984.

The previous prime is 21100010983. The next prime is 21100010999. The reversal of 21100010984 is 48901000112.

It can be written as a sum of positive squares in 3 ways, for example, as 14925508900 + 6174502084 = 122170^2 + 78578^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21100010983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7801907 + ... + 7804610.

Almost surely, 2^21100010984 is an apocalyptic number.

It is an amenable number.

21100010984 is an abundant number, since it is smaller than the sum of its proper divisors (21739880926).

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

21100010984 is a wasteful number, since it uses less digits than its factorization.

21100010984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606549 (or 15606532 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21100010984 in words is "twenty-one billion, one hundred million, ten thousand, nine hundred eighty-four".