1213100112001 has 4 divisors (see below), whose sum is σ = 1213115674032. Its totient is φ = 1213084549972.

The previous prime is 1213100111983. The next prime is 1213100112019. The reversal of 1213100112001 is 1002110013121.

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 an interprime number because it is at equal distance from previous prime (1213100111983) and next prime (1213100112019).

It is a cyclic number.

It is not a de Polignac number, because 1213100112001 - 2¹¹ = 1213100109953 is a prime.

It is a super-2 number, since 2×1213100112001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213100112031) 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, 7663495 + ... + 7820188.

It is an arithmetic number, because the mean of its divisors is an integer number (303278918508).

Almost surely, 2^{1213100112001} is an apocalyptic number.

It is an amenable number.

1213100112001 is a deficient number, since it is larger than the sum of its proper divisors (15562031).

1213100112001 is an equidigital number, since it uses as much as digits as its factorization.

1213100112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15562030.

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

Adding to 1213100112001 its reverse (1002110013121), we get a palindrome (2215210125122).

The spelling of 1213100112001 in words is "one trillion, two hundred thirteen billion, one hundred million, one hundred twelve thousand, one".