11221212010021 has 8 divisors (see below), whose sum is σ = 12084590782040. Its totient is φ = 10357863040512.

The previous prime is 11221212010009. The next prime is 11221212010051. The reversal of 11221212010021 is 12001021212211.

It can be written as a sum of positive squares in 4 ways, for example, as 39845748996 + 11181366261025 = 199614^2 + 3343855^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11221212010021 - 2⁴³ = 2425118987813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221212009977 and 11221212010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221212010051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6665556 + ... + 8177533.

It is an arithmetic number, because the mean of its divisors is an integer number (1510573847755).

Almost surely, 2^{11221212010021} is an apocalyptic number.

It is an amenable number.

11221212010021 is a deficient number, since it is larger than the sum of its proper divisors (863378772019).

11221212010021 is a wasteful number, since it uses less digits than its factorization.

11221212010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14901255.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11221212010021 its reverse (12001021212211), we get a palindrome (23222233222232).

The spelling of 11221212010021 in words is "eleven trillion, two hundred twenty-one billion, two hundred twelve million, ten thousand, twenty-one".