21100213290 has 64 divisors (see below), whose sum is σ = 54818701056. Its totient is φ = 5166968832.

The previous prime is 21100213273. The next prime is 21100213339. The reversal of 21100213290 is 9231200112.

It is a Curzon number.

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, 64894 + ... + 215433.

It is an arithmetic number, because the mean of its divisors is an integer number (856542204).

Almost surely, 2^21100213290 is an apocalyptic number.

21100213290 is an abundant number, since it is smaller than the sum of its proper divisors (33718487766).

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

21100213290 is a wasteful number, since it uses less digits than its factorization.

21100213290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280543.

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 21100213290 in words is "twenty-one billion, one hundred million, two hundred thirteen thousand, two hundred ninety".