21870922247720 has 256 divisors, whose sum is σ = 62662945766400. Its totient is φ = 6682160701440.

The previous prime is 21870922247711. The next prime is 21870922247723. The reversal of 21870922247720 is 2774222907812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21870922247723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1271039357 + ... + 1271056563.

It is an arithmetic number, because the mean of its divisors is an integer number (244777131900).

Almost surely, 2^{21870922247720} is an apocalyptic number.

21870922247720 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 21870922247720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31331472883200).

21870922247720 is an abundant number, since it is smaller than the sum of its proper divisors (40792023518680).

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

21870922247720 is a wasteful number, since it uses less digits than its factorization.

21870922247720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29308 (or 29304 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 53.

The spelling of 21870922247720 in words is "twenty-one trillion, eight hundred seventy billion, nine hundred twenty-two million, two hundred forty-seven thousand, seven hundred twenty".