11212002121 has 4 divisors (see below), whose sum is σ = 11212560000. Its totient is φ = 11211444244.

The previous prime is 11212002089. The next prime is 11212002157. The reversal of 11212002121 is 12120021211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12120021211 = 1709 ⋅7091879.

It is a cyclic number.

It is not a de Polignac number, because 11212002121 - 2⁵ = 11212002089 is a prime.

It is a super-2 number, since 2×11212002121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212008121) 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, 247621 + ... + 289378.

It is an arithmetic number, because the mean of its divisors is an integer number (2803140000).

Almost surely, 2^11212002121 is an apocalyptic number.

It is an amenable number.

11212002121 is a deficient number, since it is larger than the sum of its proper divisors (557879).

11212002121 is an equidigital number, since it uses as much as digits as its factorization.

11212002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557878.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11212002121 its reverse (12120021211), we get a palindrome (23332023332).

The spelling of 11212002121 in words is "eleven billion, two hundred twelve million, two thousand, one hundred twenty-one".