20433402134221 has 4 divisors (see below), whose sum is σ = 20713311752572. Its totient is φ = 20153492515872.

The previous prime is 20433402134207. The next prime is 20433402134237. The reversal of 20433402134221 is 12243120433402.

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 12271604517225 + 8161797616996 = 3503085^2 + 2856886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20433402134221 - 2⁹ = 20433402133709 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 (20433402134291) 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, 139954809066 + ... + 139954809211.

It is an arithmetic number, because the mean of its divisors is an integer number (5178327938143).

Almost surely, 2^{20433402134221} is an apocalyptic number.

It is an amenable number.

20433402134221 is a deficient number, since it is larger than the sum of its proper divisors (279909618351).

20433402134221 is an equidigital number, since it uses as much as digits as its factorization.

20433402134221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279909618350.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 20433402134221 its reverse (12243120433402), we get a palindrome (32676522567623).

The spelling of 20433402134221 in words is "twenty trillion, four hundred thirty-three billion, four hundred two million, one hundred thirty-four thousand, two hundred twenty-one".