11021222221221 has 4 divisors (see below), whose sum is σ = 14694962961632. Its totient is φ = 7347481480812.

The previous prime is 11021222221201. The next prime is 11021222221267. The reversal of 11021222221221 is 12212222212011.

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 not a de Polignac number, because 11021222221221 - 2⁹ = 11021222220709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021222221201) 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, 1836870370201 + ... + 1836870370206.

It is an arithmetic number, because the mean of its divisors is an integer number (3673740740408).

Almost surely, 2^{11021222221221} is an apocalyptic number.

It is an amenable number.

11021222221221 is a deficient number, since it is larger than the sum of its proper divisors (3673740740411).

11021222221221 is an equidigital number, since it uses as much as digits as its factorization.

11021222221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673740740410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 11021222221221 its reverse (12212222212011), we get a palindrome (23233444433232).

The spelling of 11021222221221 in words is "eleven trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".