21140444000 has 96 divisors (see below), whose sum is σ = 55937752416. Its totient is φ = 7805683200.

The previous prime is 21140443999. The next prime is 21140444011. The reversal of 21140444000 is 44404112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151274 + ... + 255273.

It is an arithmetic number, because the mean of its divisors is an integer number (582684921).

Almost surely, 2^21140444000 is an apocalyptic number.

21140444000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21140444000 is an abundant number, since it is smaller than the sum of its proper divisors (34797308416).

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

21140444000 is a wasteful number, since it uses less digits than its factorization.

21140444000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406585 (or 406567 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21140444000 its reverse (44404112), we get a palindrome (21184848112).

The spelling of 21140444000 in words is "twenty-one billion, one hundred forty million, four hundred forty-four thousand".