31434456421 has 4 divisors (see below), whose sum is σ = 31441725472. Its totient is φ = 31427187372.

The previous prime is 31434456379. The next prime is 31434456437. The reversal of 31434456421 is 12465443413.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12465443413 = 239 ⋅52156667.

It is a cyclic number.

It is not a de Polignac number, because 31434456421 - 2⁹ = 31434455909 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 (31434456821) 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, 3628035 + ... + 3636688.

It is an arithmetic number, because the mean of its divisors is an integer number (7860431368).

Almost surely, 2^31434456421 is an apocalyptic number.

It is an amenable number.

31434456421 is a deficient number, since it is larger than the sum of its proper divisors (7269051).

31434456421 is an equidigital number, since it uses as much as digits as its factorization.

31434456421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7269050.

The product of its digits is 138240, while the sum is 37.

Adding to 31434456421 its reverse (12465443413), we get a palindrome (43899899834).

The spelling of 31434456421 in words is "thirty-one billion, four hundred thirty-four million, four hundred fifty-six thousand, four hundred twenty-one".