11211320221 has 16 divisors (see below), whose sum is σ = 11996328960. Its totient is φ = 10454290560.

The previous prime is 11211320203. The next prime is 11211320257. The reversal of 11211320221 is 12202311211.

It is a cyclic number.

It is not a de Polignac number, because 11211320221 - 2⁷ = 11211320093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211320195 and 11211320204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211320821) 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, 439801 + ... + 464593.

It is an arithmetic number, because the mean of its divisors is an integer number (749770560).

Almost surely, 2^11211320221 is an apocalyptic number.

It is an amenable number.

11211320221 is a deficient number, since it is larger than the sum of its proper divisors (785008739).

11211320221 is a wasteful number, since it uses less digits than its factorization.

11211320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25356.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11211320221 its reverse (12202311211), we get a palindrome (23413631432).

The spelling of 11211320221 in words is "eleven billion, two hundred eleven million, three hundred twenty thousand, two hundred twenty-one".