11000021221221 has 16 divisors (see below), whose sum is σ = 15322618644480. Its totient is φ = 7006145693360.

The previous prime is 11000021221193. The next prime is 11000021221261. The reversal of 11000021221221 is 12212212000011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11000021221221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11000021221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000021221261) 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, 94948425 + ... + 95064206.

It is an arithmetic number, because the mean of its divisors is an integer number (957663665280).

Almost surely, 2^{11000021221221} is an apocalyptic number.

It is an amenable number.

11000021221221 is a deficient number, since it is larger than the sum of its proper divisors (4322597423259).

11000021221221 is a wasteful number, since it uses less digits than its factorization.

11000021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190013496.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11000021221221 its reverse (12212212000011), we get a palindrome (23212233221232).

The spelling of 11000021221221 in words is "eleven trillion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".