31232140421 has 4 divisors (see below), whose sum is σ = 31958469312. Its totient is φ = 30505811532.

The previous prime is 31232140327. The next prime is 31232140439. The reversal of 31232140421 is 12404123213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31232140421 - 2¹⁴ = 31232124037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31232140451) 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, 363164381 + ... + 363164466.

It is an arithmetic number, because the mean of its divisors is an integer number (7989617328).

Almost surely, 2^31232140421 is an apocalyptic number.

It is an amenable number.

31232140421 is a deficient number, since it is larger than the sum of its proper divisors (726328891).

31232140421 is an equidigital number, since it uses as much as digits as its factorization.

31232140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726328890.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31232140421 its reverse (12404123213), we get a palindrome (43636263634).

The spelling of 31232140421 in words is "thirty-one billion, two hundred thirty-two million, one hundred forty thousand, four hundred twenty-one".