431433143240021 has 4 divisors (see below), whose sum is σ = 464620308104652. Its totient is φ = 398245978375392.

The previous prime is 431433143240017. The next prime is 431433143240027. The reversal of 431433143240021 is 120042341334134.

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 217116865432996 + 214316277807025 = 14734886^2 + 14639545^2 .

It is a cyclic number.

It is not a de Polignac number, because 431433143240021 - 2² = 431433143240017 is a prime.

It is a super-2 number, since 2×431433143240021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431433143240027) 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, 16593582432296 + ... + 16593582432321.

It is an arithmetic number, because the mean of its divisors is an integer number (116155077026163).

Almost surely, 2^{431433143240021} is an apocalyptic number.

It is an amenable number.

431433143240021 is a deficient number, since it is larger than the sum of its proper divisors (33187164864631).

431433143240021 is a wasteful number, since it uses less digits than its factorization.

431433143240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33187164864630.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 431433143240021 its reverse (120042341334134), we get a palindrome (551475484574155).

The spelling of 431433143240021 in words is "four hundred thirty-one trillion, four hundred thirty-three billion, one hundred forty-three million, two hundred forty thousand, twenty-one".