11211220011221 has 8 divisors (see below), whose sum is σ = 11300346270720. Its totient is φ = 11122107016608.

The previous prime is 11211220011169. The next prime is 11211220011281. The reversal of 11211220011221 is 12211002211211.

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

It is a cyclic number.

It is not a de Polignac number, because 11211220011221 - 2²² = 11211215816917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211220011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211220011281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615691 + ... + 5003288.

It is an arithmetic number, because the mean of its divisors is an integer number (1412543283840).

Almost surely, 2^{11211220011221} is an apocalyptic number.

It is an amenable number.

11211220011221 is a deficient number, since it is larger than the sum of its proper divisors (89126259499).

11211220011221 is a wasteful number, since it uses less digits than its factorization.

11211220011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6632443.

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

Adding to 11211220011221 its reverse (12211002211211), we get a palindrome (23422222222432).

The spelling of 11211220011221 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, eleven thousand, two hundred twenty-one".