13433420221 has 4 divisors (see below), whose sum is σ = 14466760252. Its totient is φ = 12400080192.

The previous prime is 13433420159. The next prime is 13433420233. The reversal of 13433420221 is 12202433431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12202433431 = 127 ⋅96082153.

It can be written as a sum of positive squares in 2 ways, for example, as 4845691321 + 8587728900 = 69611^2 + 92670^2 .

It is a cyclic number.

It is not a de Polignac number, because 13433420221 - 2²⁵ = 13399865789 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 (13433420521) 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, 516669996 + ... + 516670021.

It is an arithmetic number, because the mean of its divisors is an integer number (3616690063).

Almost surely, 2^13433420221 is an apocalyptic number.

It is an amenable number.

13433420221 is a deficient number, since it is larger than the sum of its proper divisors (1033340031).

13433420221 is a wasteful number, since it uses less digits than its factorization.

13433420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033340030.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 13433420221 its reverse (12202433431), we get a palindrome (25635853652).

The spelling of 13433420221 in words is "thirteen billion, four hundred thirty-three million, four hundred twenty thousand, two hundred twenty-one".