21201022201986 has 64 divisors (see below), whose sum is σ = 54419736159360. Its totient is φ = 6046637345280.

The previous prime is 21201022201951. The next prime is 21201022201999. The reversal of 21201022201986 is 68910222010212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201022201986.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1049753331 + ... + 1049773526.

It is an arithmetic number, because the mean of its divisors is an integer number (850308377490).

Almost surely, 2^{21201022201986} is an apocalyptic number.

21201022201986 is an abundant number, since it is smaller than the sum of its proper divisors (33218713957374).

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

21201022201986 is a wasteful number, since it uses less digits than its factorization.

21201022201986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099526896 (or 2099526890 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 21201022201986 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred one thousand, nine hundred eighty-six".