11123220421 has 2 divisors, whose sum is σ = 11123220422. Its totient is φ = 11123220420.

The previous prime is 11123220413. The next prime is 11123220431. The reversal of 11123220421 is 12402232111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6182676900 + 4940543521 = 78630^2 + 70289^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123220421 - 2³ = 11123220413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11123220401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561610210 + 5561610211.

It is an arithmetic number, because the mean of its divisors is an integer number (5561610211).

Almost surely, 2^11123220421 is an apocalyptic number.

It is an amenable number.

11123220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123220421 is an equidigital number, since it uses as much as digits as its factorization.

11123220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11123220421 its reverse (12402232111), we get a palindrome (23525452532).

The spelling of 11123220421 in words is "eleven billion, one hundred twenty-three million, two hundred twenty thousand, four hundred twenty-one".