1213121330 has 16 divisors (see below), whose sum is σ = 2258916120. Its totient is φ = 468515712.

The previous prime is 1213121323. The next prime is 1213121333. The reversal of 1213121330 is 331213121.

It can be written as a sum of positive squares in 4 ways, for example, as 675948001 + 537173329 = 25999^2 + 23177^2 .

It is a super-2 number, since 2×1213121330² = 2943326722601937800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213121299 and 1213121308.

It is not an unprimeable number, because it can be changed into a prime (1213121333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2091299 + ... + 2091878.

Almost surely, 2^1213121330 is an apocalyptic number.

1213121330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213121330 is a deficient number, since it is larger than the sum of its proper divisors (1045794790).

1213121330 is a wasteful number, since it uses less digits than its factorization.

1213121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4183213.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213121330 is about 34829.8913291443. The cubic root of 1213121330 is about 1066.5177299648.

Adding to 1213121330 its reverse (331213121), we get a palindrome (1544334451).

The spelling of 1213121330 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred thirty".