21840021822 has 32 divisors (see below), whose sum is σ = 46322889984. Its totient is φ = 6840892800.

The previous prime is 21840021821. The next prime is 21840021851. The reversal of 21840021822 is 22812004812.

It is a self number, because there is not a number n which added to its sum of digits gives 21840021822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840021821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105304 + ... + 234027.

It is an arithmetic number, because the mean of its divisors is an integer number (1447590312).

Almost surely, 2^21840021822 is an apocalyptic number.

21840021822 is an abundant number, since it is smaller than the sum of its proper divisors (24482868162).

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

21840021822 is a wasteful number, since it uses less digits than its factorization.

21840021822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339984.

The product of its (nonzero) digits is 4096, while the sum is 30.

The spelling of 21840021822 in words is "twenty-one billion, eight hundred forty million, twenty-one thousand, eight hundred twenty-two".