21451330160 has 320 divisors, whose sum is σ = 58421260800. Its totient is φ = 7264567296.

The previous prime is 21451330141. The next prime is 21451330177. The reversal of 21451330160 is 6103315412.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52448036 + ... + 52448444.

It is an arithmetic number, because the mean of its divisors is an integer number (182566440).

Almost surely, 2^21451330160 is an apocalyptic number.

21451330160 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 21451330160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29210630400).

21451330160 is an abundant number, since it is smaller than the sum of its proper divisors (36969930640).

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

21451330160 is a wasteful number, since it uses less digits than its factorization.

21451330160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21451330160 its reverse (6103315412), we get a palindrome (27554645572).

The spelling of 21451330160 in words is "twenty-one billion, four hundred fifty-one million, three hundred thirty thousand, one hundred sixty".