11221221101021 has 4 divisors (see below), whose sum is σ = 11221314928512. Its totient is φ = 11221127273532.

The previous prime is 11221221100907. The next prime is 11221221101047. The reversal of 11221221101021 is 12010112212211.

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 11221221101021 - 2²⁶ = 11221153992157 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 (11221221101221) 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, 46734125 + ... + 46973618.

It is an arithmetic number, because the mean of its divisors is an integer number (2805328732128).

Almost surely, 2^{11221221101021} is an apocalyptic number.

It is an amenable number.

11221221101021 is a deficient number, since it is larger than the sum of its proper divisors (93827491).

11221221101021 is an equidigital number, since it uses as much as digits as its factorization.

11221221101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93827490.

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

Adding to 11221221101021 its reverse (12010112212211), we get a palindrome (23231333313232).

The spelling of 11221221101021 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, twenty-one".