21150023044440 has 64 divisors (see below), whose sum is σ = 63750780437760. Its totient is φ = 5613276251520.

The previous prime is 21150023044439. The next prime is 21150023044453. The reversal of 21150023044440 is 4444032005112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21150023044398 and 21150023044407.

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, 417629164 + ... + 417679803.

It is an arithmetic number, because the mean of its divisors is an integer number (996105944340).

Almost surely, 2^{21150023044440} is an apocalyptic number.

21150023044440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21150023044440 is an abundant number, since it is smaller than the sum of its proper divisors (42600757393320).

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

21150023044440 is a wasteful number, since it uses less digits than its factorization.

21150023044440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835309192 (or 835309188 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21150023044440 its reverse (4444032005112), we get a palindrome (25594055049552).

The spelling of 21150023044440 in words is "twenty-one trillion, one hundred fifty billion, twenty-three million, forty-four thousand, four hundred forty".