11021021101221 has 4 divisors (see below), whose sum is σ = 14694694801632. Its totient is φ = 7347347400812.

The previous prime is 11021021101217. The next prime is 11021021101229. The reversal of 11021021101221 is 12210112012011.

It is a happy number.

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 11021021101221 - 2² = 11021021101217 is a prime.

It is a super-2 number, since 2×11021021101221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11021021101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021021101229) 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, 1836836850201 + ... + 1836836850206.

It is an arithmetic number, because the mean of its divisors is an integer number (3673673700408).

Almost surely, 2^{11021021101221} is an apocalyptic number.

It is an amenable number.

11021021101221 is a deficient number, since it is larger than the sum of its proper divisors (3673673700411).

11021021101221 is an equidigital number, since it uses as much as digits as its factorization.

11021021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673673700410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11021021101221 its reverse (12210112012011), we get a palindrome (23231133113232).

The spelling of 11021021101221 in words is "eleven trillion, twenty-one billion, twenty-one million, one hundred one thousand, two hundred twenty-one".