1221312232130 has 16 divisors (see below), whose sum is σ = 2198580572160. Its totient is φ = 488476325232.

The previous prime is 1221312232111. The next prime is 1221312232139. The reversal of 1221312232130 is 312322131221.

It is a junction number, because it is equal to n+sod(n) for n = 1221312232096 and 1221312232105.

It is not an unprimeable number, because it can be changed into a prime (1221312232139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5965250 + ... + 6166589.

It is an arithmetic number, because the mean of its divisors is an integer number (137411285760).

Almost surely, 2^{1221312232130} is an apocalyptic number.

1221312232130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221312232130 is a deficient number, since it is larger than the sum of its proper divisors (977268340030).

1221312232130 is a wasteful number, since it uses less digits than its factorization.

1221312232130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12141913.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221312232130 its reverse (312322131221), we get a palindrome (1533634363351).

The spelling of 1221312232130 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, two hundred thirty-two thousand, one hundred thirty".