1221131423130 has 128 divisors (see below), whose sum is σ = 3066302601216. Its totient is φ = 310877568000.

The previous prime is 1221131423093. The next prime is 1221131423137. The reversal of 1221131423130 is 313241311221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221131423130.

It is not an unprimeable number, because it can be changed into a prime (1221131423137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25995144 + ... + 26042076.

It is an arithmetic number, because the mean of its divisors is an integer number (23955489072).

Almost surely, 2^{1221131423130} is an apocalyptic number.

1221131423130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221131423130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1533151300608).

1221131423130 is an abundant number, since it is smaller than the sum of its proper divisors (1845171178086).

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

1221131423130 is a wasteful number, since it uses less digits than its factorization.

1221131423130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47352.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 1221131423130 its reverse (313241311221), we get a palindrome (1534372734351).

The spelling of 1221131423130 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, four hundred twenty-three thousand, one hundred thirty".