1213232101 has 4 divisors (see below), whose sum is σ = 1220959852. Its totient is φ = 1205504352.

The previous prime is 1213232051. The next prime is 1213232113. The reversal of 1213232101 is 1012323121.

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 248819076 + 964413025 = 15774^2 + 31055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213232101 - 2⁷ = 1213231973 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 (1213232201) 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, 3863640 + ... + 3863953.

It is an arithmetic number, because the mean of its divisors is an integer number (305239963).

Almost surely, 2^1213232101 is an apocalyptic number.

It is an amenable number.

1213232101 is a deficient number, since it is larger than the sum of its proper divisors (7727751).

1213232101 is an equidigital number, since it uses as much as digits as its factorization.

1213232101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7727750.

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

The square root of 1213232101 is about 34831.4814643305. The cubic root of 1213232101 is about 1066.5501904826.

Adding to 1213232101 its reverse (1012323121), we get a palindrome (2225555222).

The spelling of 1213232101 in words is "one billion, two hundred thirteen million, two hundred thirty-two thousand, one hundred one".