11212120221 has 8 divisors (see below), whose sum is σ = 15049826400. Its totient is φ = 7424580432.

The previous prime is 11212120219. The next prime is 11212120237. The reversal of 11212120221 is 12202121211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11212120221 - 2¹ = 11212120219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11212120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212120291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12541075 + ... + 12541968.

It is an arithmetic number, because the mean of its divisors is an integer number (1881228300).

Almost surely, 2^11212120221 is an apocalyptic number.

It is an amenable number.

11212120221 is a deficient number, since it is larger than the sum of its proper divisors (3837706179).

11212120221 is a wasteful number, since it uses less digits than its factorization.

11212120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25083195.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11212120221 its reverse (12202121211), we get a palindrome (23414241432).

The spelling of 11212120221 in words is "eleven billion, two hundred twelve million, one hundred twenty thousand, two hundred twenty-one".