1213421357 has 2 divisors, whose sum is σ = 1213421358. Its totient is φ = 1213421356.

The previous prime is 1213421329. The next prime is 1213421381. The reversal of 1213421357 is 7531243121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192389961 + 21031396 = 34531^2 + 4586^2 .

It is an emirp because it is prime and its reverse (7531243121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213421357 - 2¹⁰ = 1213420333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213427357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606710678 + 606710679.

It is an arithmetic number, because the mean of its divisors is an integer number (606710679).

Almost surely, 2^1213421357 is an apocalyptic number.

It is an amenable number.

1213421357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213421357 is an equidigital number, since it uses as much as digits as its factorization.

1213421357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 1213421357 is about 34834.1980961239. The cubic root of 1213421357 is about 1066.6056458039.

Adding to 1213421357 its reverse (7531243121), we get a palindrome (8744664478).

The spelling of 1213421357 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, three hundred fifty-seven".