23434420211221 has 4 divisors (see below), whose sum is σ = 23439904516972. Its totient is φ = 23428935905472.

The previous prime is 23434420211219. The next prime is 23434420211291. The reversal of 23434420211221 is 12211202443432.

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 16220844855121 + 7213575356100 = 4027511^2 + 2685810^2 .

It is a cyclic number.

It is not a de Polignac number, because 23434420211221 - 2¹ = 23434420211219 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 (23434420211291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2742146466 + ... + 2742155011.

It is an arithmetic number, because the mean of its divisors is an integer number (5859976129243).

Almost surely, 2^{23434420211221} is an apocalyptic number.

It is an amenable number.

23434420211221 is a deficient number, since it is larger than the sum of its proper divisors (5484305751).

23434420211221 is an equidigital number, since it uses as much as digits as its factorization.

23434420211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484305750.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 23434420211221 its reverse (12211202443432), we get a palindrome (35645622654653).

The spelling of 23434420211221 in words is "twenty-three trillion, four hundred thirty-four billion, four hundred twenty million, two hundred eleven thousand, two hundred twenty-one".