21746140280 has 64 divisors (see below), whose sum is σ = 51092812800. Its totient is φ = 8314289280.

The previous prime is 21746140271. The next prime is 21746140327. The reversal of 21746140280 is 8204164712.

It is a self number, because there is not a number n which added to its sum of digits gives 21746140280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1400801 + ... + 1416239.

It is an arithmetic number, because the mean of its divisors is an integer number (798325200).

Almost surely, 2^21746140280 is an apocalyptic number.

21746140280 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 21746140280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25546406400).

21746140280 is an abundant number, since it is smaller than the sum of its proper divisors (29346672520).

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

21746140280 is a wasteful number, since it uses less digits than its factorization.

21746140280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17004 (or 17000 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 21746140280 in words is "twenty-one billion, seven hundred forty-six million, one hundred forty thousand, two hundred eighty".