1110221201821 has 2 divisors, whose sum is σ = 1110221201822. Its totient is φ = 1110221201820.

The previous prime is 1110221201819. The next prime is 1110221201879. The reversal of 1110221201821 is 1281021220111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1077414936196 + 32806265625 = 1037986^2 + 181125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1110221201821 - 2¹ = 1110221201819 is a prime.

It is a super-2 number, since 2×1110221201821² (a number of 25 digits) contains 22 as substring.

Together with 1110221201819, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1110221201792 and 1110221201801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1110221201021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555110600910 + 555110600911.

It is an arithmetic number, because the mean of its divisors is an integer number (555110600911).

Almost surely, 2^{1110221201821} is an apocalyptic number.

It is an amenable number.

1110221201821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1110221201821 is an equidigital number, since it uses as much as digits as its factorization.

1110221201821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 1110221201821 its reverse (1281021220111), we get a palindrome (2391242421932).

The spelling of 1110221201821 in words is "one trillion, one hundred ten billion, two hundred twenty-one million, two hundred one thousand, eight hundred twenty-one".