31440104521 has 24 divisors (see below), whose sum is σ = 38189267456. Its totient is φ = 25350312960.

The previous prime is 31440104519. The next prime is 31440104539. The reversal of 31440104521 is 12540104413.

It is not a de Polignac number, because 31440104521 - 2¹ = 31440104519 is a prime.

It is a super-3 number, since 3×31440104521³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31440104581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6505576 + ... + 6510406.

Almost surely, 2^31440104521 is an apocalyptic number.

It is an amenable number.

31440104521 is a deficient number, since it is larger than the sum of its proper divisors (6749162935).

31440104521 is a wasteful number, since it uses less digits than its factorization.

31440104521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8089 (or 8072 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 31440104521 its reverse (12540104413), we get a palindrome (43980208934).

The spelling of 31440104521 in words is "thirty-one billion, four hundred forty million, one hundred four thousand, five hundred twenty-one".