431402132221 has 4 divisors (see below), whose sum is σ = 456778728252. Its totient is φ = 406025536192.

The previous prime is 431402132173. The next prime is 431402132257. The reversal of 431402132221 is 122231204134.

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 363471528996 + 67930603225 = 602886^2 + 260635^2 .

It is a cyclic number.

It is not a de Polignac number, because 431402132221 - 2⁷ = 431402132093 is a prime.

It is a super-2 number, since 2×431402132221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431402132321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12688297990 + ... + 12688298023.

It is an arithmetic number, because the mean of its divisors is an integer number (114194682063).

Almost surely, 2^431402132221 is an apocalyptic number.

It is an amenable number.

431402132221 is a deficient number, since it is larger than the sum of its proper divisors (25376596031).

431402132221 is a wasteful number, since it uses less digits than its factorization.

431402132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25376596030.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 431402132221 its reverse (122231204134), we get a palindrome (553633336355).

The spelling of 431402132221 in words is "four hundred thirty-one billion, four hundred two million, one hundred thirty-two thousand, two hundred twenty-one".