21151342080 has 720 divisors, whose sum is σ = 83797105392. Its totient is φ = 5109350400.

The previous prime is 21151342061. The next prime is 21151342097. The reversal of 21151342080 is 8024315112.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 75271540 + ... + 75271820.

Almost surely, 2^21151342080 is an apocalyptic number.

21151342080 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 21151342080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41898552696).

21151342080 is an abundant number, since it is smaller than the sum of its proper divisors (62645763312).

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

21151342080 is an equidigital number, since it uses as much as digits as its factorization.

21151342080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 21151342080 its reverse (8024315112), we get a palindrome (29175657192).

The spelling of 21151342080 in words is "twenty-one billion, one hundred fifty-one million, three hundred forty-two thousand, eighty".