21844406490 has 32 divisors (see below), whose sum is σ = 52437447360. Its totient is φ = 5823967104.

The previous prime is 21844406483. The next prime is 21844406497. The reversal of 21844406490 is 9460444812.

21844406490 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21844406483) and next prime (21844406497).

It is a super-3 number, since 3×21844406490³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21844406497) 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, 76606 + ... + 222614.

It is an arithmetic number, because the mean of its divisors is an integer number (1638670230).

Almost surely, 2^21844406490 is an apocalyptic number.

21844406490 is an abundant number, since it is smaller than the sum of its proper divisors (30593040870).

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

21844406490 is a wasteful number, since it uses less digits than its factorization.

21844406490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151006.

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 21844406490 in words is "twenty-one billion, eight hundred forty-four million, four hundred six thousand, four hundred ninety".