21429786980808 has 160 divisors (see below), whose sum is σ = 62206558444800. Its totient is φ = 6884330963328.

The previous prime is 21429786980773. The next prime is 21429786980843. The reversal of 21429786980808 is 80808968792412.

It is an interprime number because it is at equal distance from previous prime (21429786980773) and next prime (21429786980843).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9236841 + ... + 11321607.

It is an arithmetic number, because the mean of its divisors is an integer number (388790990280).

Almost surely, 2^{21429786980808} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21429786980808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31103279222400).

21429786980808 is an abundant number, since it is smaller than the sum of its proper divisors (40776771463992).

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

21429786980808 is a wasteful number, since it uses less digits than its factorization.

21429786980808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085361 (or 2085348 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 72.

The spelling of 21429786980808 in words is "twenty-one trillion, four hundred twenty-nine billion, seven hundred eighty-six million, nine hundred eighty thousand, eight hundred eight".