11211212202221 has 4 divisors (see below), whose sum is σ = 11214178920000. Its totient is φ = 11208245484444.

The previous prime is 11211212202217. The next prime is 11211212202227. The reversal of 11211212202221 is 12220221211211.

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 11211212202221 - 2² = 11211212202217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211212202193 and 11211212202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211212202227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483353221 + ... + 1483360778.

It is an arithmetic number, because the mean of its divisors is an integer number (2803544730000).

Almost surely, 2^{11211212202221} is an apocalyptic number.

It is an amenable number.

11211212202221 is a deficient number, since it is larger than the sum of its proper divisors (2966717779).

11211212202221 is an equidigital number, since it uses as much as digits as its factorization.

11211212202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966717778.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11211212202221 its reverse (12220221211211), we get a palindrome (23431433413432).

The spelling of 11211212202221 in words is "eleven trillion, two hundred eleven billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".