21841841640 has 32 divisors (see below), whose sum is σ = 65525525280. Its totient is φ = 5824491072.

The previous prime is 21841841611. The next prime is 21841841641. The reversal of 21841841640 is 4614814812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21841841641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91007554 + ... + 91007793.

It is an arithmetic number, because the mean of its divisors is an integer number (2047672665).

Almost surely, 2^21841841640 is an apocalyptic number.

21841841640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21841841640 is an abundant number, since it is smaller than the sum of its proper divisors (43683683640).

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

21841841640 is a wasteful number, since it uses less digits than its factorization.

21841841640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182015361 (or 182015357 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The spelling of 21841841640 in words is "twenty-one billion, eight hundred forty-one million, eight hundred forty-one thousand, six hundred forty".