431401401421 has 4 divisors (see below), whose sum is σ = 435219113052. Its totient is φ = 427583689792.

The previous prime is 431401401401. The next prime is 431401401437. The reversal of 431401401421 is 124104104134.

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 70482816196 + 360918585225 = 265486^2 + 600765^2 .

It is a cyclic number.

It is not a de Polignac number, because 431401401421 - 2¹⁵ = 431401368653 is a prime.

It is a super-2 number, since 2×431401401421² (a number of 24 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 (431401401401) 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, 1908855646 + ... + 1908855871.

It is an arithmetic number, because the mean of its divisors is an integer number (108804778263).

Almost surely, 2^431401401421 is an apocalyptic number.

It is an amenable number.

431401401421 is a deficient number, since it is larger than the sum of its proper divisors (3817711631).

431401401421 is a wasteful number, since it uses less digits than its factorization.

431401401421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817711630.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 431401401421 its reverse (124104104134), we get a palindrome (555505505555).

The spelling of 431401401421 in words is "four hundred thirty-one billion, four hundred one million, four hundred one thousand, four hundred twenty-one".