11021022012221 has 16 divisors (see below), whose sum is σ = 12034505733936. Its totient is φ = 10031283979776.

The previous prime is 11021022012167. The next prime is 11021022012227. The reversal of 11021022012221 is 12221022012011.

It can be written as a sum of positive squares in 8 ways, for example, as 34647727321 + 10986374284900 = 186139^2 + 3314570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021022012221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11021022012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021022012227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2149451 + ... + 5163543.

It is an arithmetic number, because the mean of its divisors is an integer number (752156608371).

Almost surely, 2^{11021022012221} is an apocalyptic number.

It is an amenable number.

11021022012221 is a deficient number, since it is larger than the sum of its proper divisors (1013483721715).

11021022012221 is a wasteful number, since it uses less digits than its factorization.

11021022012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018032.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11021022012221 its reverse (12221022012011), we get a palindrome (23242044024232).

The spelling of 11021022012221 in words is "eleven trillion, twenty-one billion, twenty-two million, twelve thousand, two hundred twenty-one".