1221221010180 has 96 divisors (see below), whose sum is σ = 3568692121344. Its totient is φ = 311447217664.

The previous prime is 1221221010127. The next prime is 1221221010181. The reversal of 1221221010180 is 810101221221.

It is not an unprimeable number, because it can be changed into a prime (1221221010181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8447062 + ... + 8590418.

It is an arithmetic number, because the mean of its divisors is an integer number (37173876264).

Almost surely, 2^{1221221010180} is an apocalyptic number.

1221221010180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221221010180 is an abundant number, since it is smaller than the sum of its proper divisors (2347471111164).

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

1221221010180 is a wasteful number, since it uses less digits than its factorization.

1221221010180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149565 (or 149563 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The spelling of 1221221010180 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, ten thousand, one hundred eighty".