1221312130 has 32 divisors (see below), whose sum is σ = 2329553520. Its totient is φ = 459417600.

The previous prime is 1221312091. The next prime is 1221312149. The reversal of 1221312130 is 312131221.

It can be written as a sum of positive squares in 8 ways, for example, as 435014449 + 786297681 = 20857^2 + 28041^2 .

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, 304176 + ... + 308164.

Almost surely, 2^1221312130 is an apocalyptic number.

1221312130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221312130 is a deficient number, since it is larger than the sum of its proper divisors (1108241390).

1221312130 is a wasteful number, since it uses less digits than its factorization.

1221312130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221312130 is about 34947.2764317908. The cubic root of 1221312130 is about 1068.9126666441.

Adding to 1221312130 its reverse (312131221), we get a palindrome (1533443351).

The spelling of 1221312130 in words is "one billion, two hundred twenty-one million, three hundred twelve thousand, one hundred thirty".