21427744045000 has 80 divisors (see below), whose sum is σ = 50246069157900. Its totient is φ = 8564121120000.

The previous prime is 21427744044997. The next prime is 21427744045063. The reversal of 21427744045000 is 54044772412.

It can be written as a sum of positive squares in 10 ways, for example, as 346918644004 + 21080825400996 = 588998^2 + 4591386^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4401490 + ... + 7888510.

Almost surely, 2^{21427744045000} is an apocalyptic number.

21427744045000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21427744045000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25123034578950).

21427744045000 is an abundant number, since it is smaller than the sum of its proper divisors (28818325112900).

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

21427744045000 is a wasteful number, since it uses less digits than its factorization.

21427744045000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488276 (or 3488257 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 40.

The spelling of 21427744045000 in words is "twenty-one trillion, four hundred twenty-seven billion, seven hundred forty-four million, forty-five thousand".