1213421307 has 16 divisors (see below), whose sum is σ = 1857104640. Its totient is φ = 690352992.

The previous prime is 1213421269. The next prime is 1213421323. The reversal of 1213421307 is 7031243121.

It is a happy number.

It is not a de Polignac number, because 1213421307 - 2⁶ = 1213421243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213421357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121353 + ... + 130970.

It is an arithmetic number, because the mean of its divisors is an integer number (116069040).

Almost surely, 2^1213421307 is an apocalyptic number.

1213421307 is a deficient number, since it is larger than the sum of its proper divisors (643683333).

1213421307 is a wasteful number, since it uses less digits than its factorization.

1213421307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252562.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1213421307 is about 34834.1973784383. The cubic root of 1213421307 is about 1066.6056311538.

Adding to 1213421307 its reverse (7031243121), we get a palindrome (8244664428).

The spelling of 1213421307 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, three hundred seven".