31440211421 has 8 divisors (see below), whose sum is σ = 31623031104. Its totient is φ = 31257861120.

The previous prime is 31440211393. The next prime is 31440211433. The reversal of 31440211421 is 12411204413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31440211421 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 (31440211921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17456 + ... + 251366.

It is an arithmetic number, because the mean of its divisors is an integer number (3952878888).

Almost surely, 2^31440211421 is an apocalyptic number.

It is an amenable number.

31440211421 is a deficient number, since it is larger than the sum of its proper divisors (182819683).

31440211421 is a wasteful number, since it uses less digits than its factorization.

31440211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234691.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 31440211421 its reverse (12411204413), we get a palindrome (43851415834).

The spelling of 31440211421 in words is "thirty-one billion, four hundred forty million, two hundred eleven thousand, four hundred twenty-one".