11220543421 has 2 divisors, whose sum is σ = 11220543422. Its totient is φ = 11220543420.

The previous prime is 11220543413. The next prime is 11220543437. The reversal of 11220543421 is 12434502211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9022340196 + 2198203225 = 94986^2 + 46885^2 .

It is an emirp because it is prime and its reverse (12434502211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11220543421 - 2³ = 11220543413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220547421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610271710 + 5610271711.

It is an arithmetic number, because the mean of its divisors is an integer number (5610271711).

Almost surely, 2^11220543421 is an apocalyptic number.

It is an amenable number.

11220543421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220543421 is an equidigital number, since it uses as much as digits as its factorization.

11220543421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 11220543421 in words is "eleven billion, two hundred twenty million, five hundred forty-three thousand, four hundred twenty-one".