31444413421 has 8 divisors (see below), whose sum is σ = 31756251800. Its totient is φ = 31134093120.

The previous prime is 31444413419. The next prime is 31444413437. The reversal of 31444413421 is 12431444413.

It can be written as a sum of positive squares in 4 ways, for example, as 9676656900 + 21767756521 = 98370^2 + 147539^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31444413421 - 2¹ = 31444413419 is a prime.

It is a super-2 number, since 2×31444413421² (a number of 22 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 (31444419421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337866 + ... + 420763.

It is an arithmetic number, because the mean of its divisors is an integer number (3969531475).

Almost surely, 2^31444413421 is an apocalyptic number.

It is an amenable number.

31444413421 is a deficient number, since it is larger than the sum of its proper divisors (311838379).

31444413421 is a wasteful number, since it uses less digits than its factorization.

31444413421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759039.

The product of its digits is 18432, while the sum is 31.

Adding to 31444413421 its reverse (12431444413), we get a palindrome (43875857834).

The spelling of 31444413421 in words is "thirty-one billion, four hundred forty-four million, four hundred thirteen thousand, four hundred twenty-one".