21901342080 has 256 divisors, whose sum is σ = 74619740160. Its totient is φ = 5444567040.

The previous prime is 21901342079. The next prime is 21901342103. The reversal of 21901342080 is 8024310912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3489345 + ... + 3495615.

It is an arithmetic number, because the mean of its divisors is an integer number (291483360).

Almost surely, 2^21901342080 is an apocalyptic number.

21901342080 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 21901342080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37309870080).

21901342080 is an abundant number, since it is smaller than the sum of its proper divisors (52718398080).

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

21901342080 is a wasteful number, since it uses less digits than its factorization.

21901342080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6417 (or 6405 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 21901342080 its reverse (8024310912), we get a palindrome (29925652992).

The spelling of 21901342080 in words is "twenty-one billion, nine hundred one million, three hundred forty-two thousand, eighty".