21392882727780 has 192 divisors, whose sum is σ = 63853288692480. Its totient is φ = 5332846411776.

The previous prime is 21392882727767. The next prime is 21392882727829. The reversal of 21392882727780 is 8772728829312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 417779659 + ... + 417830861.

It is an arithmetic number, because the mean of its divisors is an integer number (332569211940).

Almost surely, 2^{21392882727780} is an apocalyptic number.

21392882727780 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 21392882727780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31926644346240).

21392882727780 is an abundant number, since it is smaller than the sum of its proper divisors (42460405964700).

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

21392882727780 is a wasteful number, since it uses less digits than its factorization.

21392882727780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53998 (or 53996 counting only the distinct ones).

The product of its (nonzero) digits is 75866112, while the sum is 66.

The spelling of 21392882727780 in words is "twenty-one trillion, three hundred ninety-two billion, eight hundred eighty-two million, seven hundred twenty-seven thousand, seven hundred eighty".