11212221012021 has 6 divisors (see below), whose sum is σ = 16195430350710. Its totient is φ = 7474814008008.

The previous prime is 11212221011969. The next prime is 11212221012043. The reversal of 11212221012021 is 12021012221211.

It can be written as a sum of positive squares in only one way, i.e., 7025945422500 + 4186275589521 = 2650650^2 + 2046039^2 .

It is not a de Polignac number, because 11212221012021 - 2¹³ = 11212221003829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212221011985 and 11212221012003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212221012071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622901167326 + ... + 622901167343.

It is an arithmetic number, because the mean of its divisors is an integer number (2699238391785).

Almost surely, 2^{11212221012021} is an apocalyptic number.

It is an amenable number.

11212221012021 is a deficient number, since it is larger than the sum of its proper divisors (4983209338689).

11212221012021 is a wasteful number, since it uses less digits than its factorization.

11212221012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245802334675 (or 1245802334672 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11212221012021 its reverse (12021012221211), we get a palindrome (23233233233232).

The spelling of 11212221012021 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-one million, twelve thousand, twenty-one".