21211000109984 has 24 divisors (see below), whose sum is σ = 43199127381060. Its totient is φ = 10239793156096.

The previous prime is 21211000109963. The next prime is 21211000109987. The reversal of 21211000109984 is 48990100011212.

It can be written as a sum of positive squares in 2 ways, for example, as 20837654669584 + 373345440400 = 4564828^2 + 611020^2 .

It is not an unprimeable number, because it can be changed into a prime (21211000109987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11428339649 + ... + 11428341504.

Almost surely, 2^{21211000109984} is an apocalyptic number.

It is an amenable number.

21211000109984 is an abundant number, since it is smaller than the sum of its proper divisors (21988127271076).

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

21211000109984 is a wasteful number, since it uses less digits than its factorization.

21211000109984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22856681192 (or 22856681184 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 21211000109984 in words is "twenty-one trillion, two hundred eleven billion, one hundred nine thousand, nine hundred eighty-four".