11221111100021 has 4 divisors (see below), whose sum is σ = 11221180489344. Its totient is φ = 11221041710700.

The previous prime is 11221111099981. The next prime is 11221111100113. The reversal of 11221111100021 is 12000111112211.

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 11221111100021 - 2¹⁰ = 11221111098997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221111099969 and 11221111100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221111105021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34451525 + ... + 34775706.

It is an arithmetic number, because the mean of its divisors is an integer number (2805295122336).

Almost surely, 2^{11221111100021} is an apocalyptic number.

It is an amenable number.

11221111100021 is a deficient number, since it is larger than the sum of its proper divisors (69389323).

11221111100021 is an equidigital number, since it uses as much as digits as its factorization.

11221111100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69389322.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 11221111100021 its reverse (12000111112211), we get a palindrome (23221222212232).

The spelling of 11221111100021 in words is "eleven trillion, two hundred twenty-one billion, one hundred eleven million, one hundred thousand, twenty-one".