20233666644421 has 4 divisors (see below), whose sum is σ = 20510840160172. Its totient is φ = 19956493128672.

The previous prime is 20233666644349. The next prime is 20233666644463. The reversal of 20233666644421 is 12444666633202.

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 15152762949025 + 5080903695396 = 3892655^2 + 2254086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20233666644421 - 2⁹ = 20233666643909 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 (20233666644481) 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, 138586757766 + ... + 138586757911.

It is an arithmetic number, because the mean of its divisors is an integer number (5127710040043).

Almost surely, 2^{20233666644421} is an apocalyptic number.

It is an amenable number.

20233666644421 is a deficient number, since it is larger than the sum of its proper divisors (277173515751).

20233666644421 is an equidigital number, since it uses as much as digits as its factorization.

20233666644421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277173515750.

The product of its (nonzero) digits is 5971968, while the sum is 49.

The spelling of 20233666644421 in words is "twenty trillion, two hundred thirty-three billion, six hundred sixty-six million, six hundred forty-four thousand, four hundred twenty-one".