11212121011201 has 4 divisors (see below), whose sum is σ = 12231404739504. Its totient is φ = 10192837282900.

The previous prime is 11212121011199. The next prime is 11212121011213. The reversal of 11212121011201 is 10211012121211.

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 11212121011201 - 2¹ = 11212121011199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212121011901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509641864135 + ... + 509641864156.

It is an arithmetic number, because the mean of its divisors is an integer number (3057851184876).

Almost surely, 2^{11212121011201} is an apocalyptic number.

11212121011201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11212121011201 is a deficient number, since it is larger than the sum of its proper divisors (1019283728303).

11212121011201 is a wasteful number, since it uses less digits than its factorization.

11212121011201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019283728302.

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

Adding to 11212121011201 its reverse (10211012121211), we get a palindrome (21423133132412).

The spelling of 11212121011201 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred one".