11220211121021 has 12 divisors (see below), whose sum is σ = 13052168146332. Its totient is φ = 9617260580928.

The previous prime is 11220211121017. The next prime is 11220211121023. The reversal of 11220211121021 is 12012111202211.

It can be written as a sum of positive squares in 2 ways, for example, as 8980294797796 + 2239916323225 = 2996714^2 + 1496635^2 .

It is not a de Polignac number, because 11220211121021 - 2² = 11220211121017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220211121023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7744001 + ... + 9077993.

It is an arithmetic number, because the mean of its divisors is an integer number (1087680678861).

Almost surely, 2^{11220211121021} is an apocalyptic number.

It is an amenable number.

11220211121021 is a deficient number, since it is larger than the sum of its proper divisors (1831957025311).

11220211121021 is a wasteful number, since it uses less digits than its factorization.

11220211121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505660 (or 1505653 counting only the distinct ones).

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

Adding to 11220211121021 its reverse (12012111202211), we get a palindrome (23232322323232).

The spelling of 11220211121021 in words is "eleven trillion, two hundred twenty billion, two hundred eleven million, one hundred twenty-one thousand, twenty-one".