1211203013 has 12 divisors (see below), whose sum is σ = 1291521420. Its totient is φ = 1135593216.

The previous prime is 1211203001. The next prime is 1211203031. The reversal of 1211203013 is 3103021121.

It can be written as a sum of positive squares in 2 ways, for example, as 165456769 + 1045746244 = 12863^2 + 32338^2 .

It is not a de Polignac number, because 1211203013 - 2¹⁰ = 1211201989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211203073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17723 + ... + 52311.

It is an arithmetic number, because the mean of its divisors is an integer number (107626785).

Almost surely, 2^1211203013 is an apocalyptic number.

It is an amenable number.

1211203013 is a deficient number, since it is larger than the sum of its proper divisors (80318407).

1211203013 is an equidigital number, since it uses as much as digits as its factorization.

1211203013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34724 (or 34705 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1211203013 is about 34802.3420619935. The cubic root of 1211203013 is about 1065.9552694758.

Adding to 1211203013 its reverse (3103021121), we get a palindrome (4314224134).

The spelling of 1211203013 in words is "one billion, two hundred eleven million, two hundred three thousand, thirteen".