1213112101 has 4 divisors (see below), whose sum is σ = 1214754400. Its totient is φ = 1211469804.

The previous prime is 1213112083. The next prime is 1213112113. The reversal of 1213112101 is 1012113121.

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 1213112101 - 2¹¹ = 1213110053 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 (1213112701) 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, 820041 + ... + 821518.

It is an arithmetic number, because the mean of its divisors is an integer number (303688600).

Almost surely, 2^1213112101 is an apocalyptic number.

It is an amenable number.

1213112101 is a deficient number, since it is larger than the sum of its proper divisors (1642299).

1213112101 is an equidigital number, since it uses as much as digits as its factorization.

1213112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642298.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1213112101 is about 34829.7588421166. The cubic root of 1213112101 is about 1066.5150253941.

Adding to 1213112101 its reverse (1012113121), we get a palindrome (2225225222).

The spelling of 1213112101 in words is "one billion, two hundred thirteen million, one hundred twelve thousand, one hundred one".