21179289280 has 224 divisors, whose sum is σ = 54565539840. Its totient is φ = 7811543040.

The previous prime is 21179289259. The next prime is 21179289301. The reversal of 21179289280 is 8298297112.

It is an interprime number because it is at equal distance from previous prime (21179289259) and next prime (21179289301).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23876997 + ... + 23877883.

It is an arithmetic number, because the mean of its divisors is an integer number (243596160).

Almost surely, 2^21179289280 is an apocalyptic number.

21179289280 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 21179289280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27282769920).

21179289280 is an abundant number, since it is smaller than the sum of its proper divisors (33386250560).

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

21179289280 is a wasteful number, since it uses less digits than its factorization.

21179289280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 21179289280 in words is "twenty-one billion, one hundred seventy-nine million, two hundred eighty-nine thousand, two hundred eighty".