1211213013 has 4 divisors (see below), whose sum is σ = 1614950688. Its totient is φ = 807475340.

The previous prime is 1211212993. The next prime is 1211213023. The reversal of 1211213013 is 3103121121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211213013 - 2¹⁶ = 1211147477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211212983 and 1211213001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211213023) 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 3 ways as a sum of consecutive naturals, for example, 201868833 + ... + 201868838.

It is an arithmetic number, because the mean of its divisors is an integer number (403737672).

Almost surely, 2^1211213013 is an apocalyptic number.

It is an amenable number.

1211213013 is a deficient number, since it is larger than the sum of its proper divisors (403737675).

1211213013 is an equidigital number, since it uses as much as digits as its factorization.

1211213013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403737674.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1211213013 is about 34802.4857301889. The cubic root of 1211213013 is about 1065.9582030670.

Adding to 1211213013 its reverse (3103121121), we get a palindrome (4314334134).

The spelling of 1211213013 in words is "one billion, two hundred eleven million, two hundred thirteen thousand, thirteen".