11021012211221 has 4 divisors (see below), whose sum is σ = 11021025314892. Its totient is φ = 11020999107552.

The previous prime is 11021012211217. The next prime is 11021012211247. The reversal of 11021012211221 is 12211221012011.

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 125163826225 + 10895848384996 = 353785^2 + 3300886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021012211221 - 2² = 11021012211217 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 11021012211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021012219221) 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, 5196830 + ... + 7003503.

It is an arithmetic number, because the mean of its divisors is an integer number (2755256328723).

Almost surely, 2^{11021012211221} is an apocalyptic number.

It is an amenable number.

11021012211221 is a deficient number, since it is larger than the sum of its proper divisors (13103671).

11021012211221 is an equidigital number, since it uses as much as digits as its factorization.

11021012211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13103670.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11021012211221 its reverse (12211221012011), we get a palindrome (23232233223232).

The spelling of 11021012211221 in words is "eleven trillion, twenty-one billion, twelve million, two hundred eleven thousand, two hundred twenty-one".