1121221000021 has 2 divisors, whose sum is σ = 1121221000022. Its totient is φ = 1121221000020.

The previous prime is 1121220999949. The next prime is 1121221000099. The reversal of 1121221000021 is 1200001221211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1041397799121 + 79823200900 = 1020489^2 + 282530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121221000021 - 2¹³ = 1121220991829 is a prime.

It is a super-3 number, since 3×1121221000021³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1121220999965 and 1121221000010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121221000421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560610500010 + 560610500011.

It is an arithmetic number, because the mean of its divisors is an integer number (560610500011).

Almost surely, 2^{1121221000021} is an apocalyptic number.

It is an amenable number.

1121221000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121221000021 is an equidigital number, since it uses as much as digits as its factorization.

1121221000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1121221000021 its reverse (1200001221211), we get a palindrome (2321222221232).

The spelling of 1121221000021 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.