22011240421 has 4 divisors (see below), whose sum is σ = 22011695244. Its totient is φ = 22010785600.

The previous prime is 22011240413. The next prime is 22011240431. The reversal of 22011240421 is 12404211022.

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 17398929025 + 4612311396 = 131905^2 + 67914^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011240421 - 2³ = 22011240413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011240431) 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, 144820 + ... + 254941.

It is an arithmetic number, because the mean of its divisors is an integer number (5502923811).

Almost surely, 2^22011240421 is an apocalyptic number.

It is an amenable number.

22011240421 is a deficient number, since it is larger than the sum of its proper divisors (454823).

22011240421 is an equidigital number, since it uses as much as digits as its factorization.

22011240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454822.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22011240421 its reverse (12404211022), we get a palindrome (34415451443).

The spelling of 22011240421 in words is "twenty-two billion, eleven million, two hundred forty thousand, four hundred twenty-one".