1213233101 has 4 divisors (see below), whose sum is σ = 1284599772. Its totient is φ = 1141866432.

The previous prime is 1213233037. The next prime is 1213233121. The reversal of 1213233101 is 1013323121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 506205001 + 707028100 = 22499^2 + 26590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213233101 - 2⁶ = 1213233037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 71366653 = 1213233101 / (1 + 2 + 1 + 3 + 2 + 3 + 3 + 1 + 0 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213233101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213233121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35683310 + ... + 35683343.

It is an arithmetic number, because the mean of its divisors is an integer number (321149943).

Almost surely, 2^1213233101 is an apocalyptic number.

It is an amenable number.

1213233101 is a deficient number, since it is larger than the sum of its proper divisors (71366671).

1213233101 is an equidigital number, since it uses as much as digits as its factorization.

1213233101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71366670.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213233101 is about 34831.4958191577. The cubic root of 1213233101 is about 1066.5504835153.

Adding to 1213233101 its reverse (1013323121), we get a palindrome (2226556222).

The spelling of 1213233101 in words is "one billion, two hundred thirteen million, two hundred thirty-three thousand, one hundred one".