11220202421 has 4 divisors (see below), whose sum is σ = 11222996844. Its totient is φ = 11217408000.

The previous prime is 11220202379. The next prime is 11220202429. The reversal of 11220202421 is 12420202211.

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 580279921 + 10639922500 = 24089^2 + 103150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220202421 is a prime.

It is a super-2 number, since 2×11220202421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11220202421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220202429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391180 + ... + 1399221.

It is an arithmetic number, because the mean of its divisors is an integer number (2805749211).

Almost surely, 2^11220202421 is an apocalyptic number.

It is an amenable number.

11220202421 is a deficient number, since it is larger than the sum of its proper divisors (2794423).

11220202421 is an equidigital number, since it uses as much as digits as its factorization.

11220202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794422.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 11220202421 its reverse (12420202211), we get a palindrome (23640404632).

The spelling of 11220202421 in words is "eleven billion, two hundred twenty million, two hundred two thousand, four hundred twenty-one".