11143321421 has 4 divisors (see below), whose sum is σ = 11144781372. Its totient is φ = 11141861472.

The previous prime is 11143321417. The next prime is 11143321429. The reversal of 11143321421 is 12412334111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12412334111 = 463 ⋅26808497.

It can be written as a sum of positive squares in 2 ways, for example, as 4101762025 + 7041559396 = 64045^2 + 83914^2 .

It is a cyclic number.

It is not a de Polignac number, because 11143321421 - 2² = 11143321417 is a prime.

It is a super-2 number, since 2×11143321421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11143321429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718466 + ... + 733811.

It is an arithmetic number, because the mean of its divisors is an integer number (2786195343).

Almost surely, 2^11143321421 is an apocalyptic number.

It is an amenable number.

11143321421 is a deficient number, since it is larger than the sum of its proper divisors (1459951).

11143321421 is an equidigital number, since it uses as much as digits as its factorization.

11143321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459950.

The product of its digits is 576, while the sum is 23.

Adding to 11143321421 its reverse (12412334111), we get a palindrome (23555655532).

The spelling of 11143321421 in words is "eleven billion, one hundred forty-three million, three hundred twenty-one thousand, four hundred twenty-one".