21499890549120 has 896 divisors, whose sum is σ = 78574619289600. Its totient is φ = 5621786726400.

The previous prime is 21499890549107. The next prime is 21499890549167. The reversal of 21499890549120 is 2194509899412.

21499890549120 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 9 + 89 + 0 + 549 + 1 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 5565592309 + ... + 5565596171.

It is an arithmetic number, because the mean of its divisors is an integer number (87694887600).

Almost surely, 2^{21499890549120} is an apocalyptic number.

21499890549120 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 21499890549120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39287309644800).

21499890549120 is an abundant number, since it is smaller than the sum of its proper divisors (57074728740480).

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

21499890549120 is an equidigital number, since it uses as much as digits as its factorization.

21499890549120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 63.

The spelling of 21499890549120 in words is "twenty-one trillion, four hundred ninety-nine billion, eight hundred ninety million, five hundred forty-nine thousand, one hundred twenty".