11212202001221 has 4 divisors (see below), whose sum is σ = 12074679078252. Its totient is φ = 10349724924192.

The previous prime is 11212202001193. The next prime is 11212202001229. The reversal of 11212202001221 is 12210020221211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3040385068900 + 8171816932321 = 1743670^2 + 2858639^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212202001221 - 2⁶ = 11212202001157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11212202001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212202001229) 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, 431238538496 + ... + 431238538521.

It is an arithmetic number, because the mean of its divisors is an integer number (3018669769563).

Almost surely, 2^{11212202001221} is an apocalyptic number.

It is an amenable number.

11212202001221 is a deficient number, since it is larger than the sum of its proper divisors (862477077031).

11212202001221 is an equidigital number, since it uses as much as digits as its factorization.

11212202001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862477077030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11212202001221 its reverse (12210020221211), we get a palindrome (23422222222432).

The spelling of 11212202001221 in words is "eleven trillion, two hundred twelve billion, two hundred two million, one thousand, two hundred twenty-one".