1211201112013 has 4 divisors (see below), whose sum is σ = 1231729944480. Its totient is φ = 1190672279548.

The previous prime is 1211201111971. The next prime is 1211201112019. The reversal of 1211201112013 is 3102111021121.

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 1211201112013 - 2¹³ = 1211201103821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201112019) 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, 10264416145 + ... + 10264416262.

It is an arithmetic number, because the mean of its divisors is an integer number (307932486120).

Almost surely, 2^{1211201112013} is an apocalyptic number.

It is an amenable number.

1211201112013 is a deficient number, since it is larger than the sum of its proper divisors (20528832467).

1211201112013 is an equidigital number, since it uses as much as digits as its factorization.

1211201112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20528832466.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1211201112013 its reverse (3102111021121), we get a palindrome (4313312133134).

The spelling of 1211201112013 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred twelve thousand, thirteen".