1213211773 has 2 divisors, whose sum is σ = 1213211774. Its totient is φ = 1213211772.

The previous prime is 1213211767. The next prime is 1213211801. The reversal of 1213211773 is 3771123121.

It is an a-pointer prime, because the next prime (1213211801) can be obtained adding 1213211773 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1201800889 + 11410884 = 34667^2 + 3378^2 .

It is an emirp because it is prime and its reverse (3771123121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213211773 - 2¹³ = 1213203581 is a prime.

It is a super-2 number, since 2×1213211773² = 2943765612291607058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213211743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606605886 + 606605887.

It is an arithmetic number, because the mean of its divisors is an integer number (606605887).

Almost surely, 2^1213211773 is an apocalyptic number.

It is an amenable number.

1213211773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213211773 is an equidigital number, since it uses as much as digits as its factorization.

1213211773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 28.

The square root of 1213211773 is about 34831.1896581211. The cubic root of 1213211773 is about 1066.5442336798.

Adding to 1213211773 its reverse (3771123121), we get a palindrome (4984334894).

The spelling of 1213211773 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, seven hundred seventy-three".