11121001020221 has 4 divisors (see below), whose sum is σ = 11135387826972. Its totient is φ = 11106614213472.

The previous prime is 11121001020191. The next prime is 11121001020253. The reversal of 11121001020221 is 12202010012111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 701088036100 + 10419912984121 = 837310^2 + 3227989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121001020221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121001020196 and 11121001020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121001025221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7193402216 + ... + 7193403761.

It is an arithmetic number, because the mean of its divisors is an integer number (2783846956743).

Almost surely, 2^{11121001020221} is an apocalyptic number.

It is an amenable number.

11121001020221 is a deficient number, since it is larger than the sum of its proper divisors (14386806751).

11121001020221 is an equidigital number, since it uses as much as digits as its factorization.

11121001020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14386806750.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11121001020221 its reverse (12202010012111), we get a palindrome (23323011032332).

The spelling of 11121001020221 in words is "eleven trillion, one hundred twenty-one billion, one million, twenty thousand, two hundred twenty-one".