12981661220 has 48 divisors (see below), whose sum is σ = 29814172416. Its totient is φ = 4708800000.

The previous prime is 12981661201. The next prime is 12981661241. The reversal of 12981661220 is 2216618921.

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, 14645 + ... + 161795.

It is an arithmetic number, because the mean of its divisors is an integer number (621128592).

Almost surely, 2^12981661220 is an apocalyptic number.

12981661220 is a gapful number since it is divisible by the number (10) 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 12981661220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14907086208).

12981661220 is an abundant number, since it is smaller than the sum of its proper divisors (16832511196).

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

12981661220 is a wasteful number, since it uses less digits than its factorization.

12981661220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147572 (or 147570 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 12981661220 in words is "twelve billion, nine hundred eighty-one million, six hundred sixty-one thousand, two hundred twenty".