1231201213 has 8 divisors (see below), whose sum is σ = 1344466656. Its totient is φ = 1118158800.

The previous prime is 1231201199. The next prime is 1231201229. The reversal of 1231201213 is 3121021321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231201213 - 2²⁵ = 1197646781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231201253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44103 + ... + 66388.

It is an arithmetic number, because the mean of its divisors is an integer number (168058332).

Almost surely, 2^1231201213 is an apocalyptic number.

It is an amenable number.

1231201213 is a deficient number, since it is larger than the sum of its proper divisors (113265443).

1231201213 is a wasteful number, since it uses less digits than its factorization.

1231201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111515.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1231201213 is about 35088.4769261933. The cubic root of 1231201213 is about 1071.7899446067.

Adding to 1231201213 its reverse (3121021321), we get a palindrome (4352222534).

The spelling of 1231201213 in words is "one billion, two hundred thirty-one million, two hundred one thousand, two hundred thirteen".