31321236040 has 64 divisors (see below), whose sum is σ = 71198818560. Its totient is φ = 12399744000.

The previous prime is 31321236031. The next prime is 31321236059. The reversal of 31321236040 is 4063212313.

It is a super-4 number, since 4×31321236040⁴ (a number of 43 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321235996 and 31321236014.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3389907 + ... + 3399133.

It is an arithmetic number, because the mean of its divisors is an integer number (1112481540).

Almost surely, 2^31321236040 is an apocalyptic number.

It is an amenable number.

31321236040 is an abundant number, since it is smaller than the sum of its proper divisors (39877582520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31321236040 is a wasteful number, since it uses less digits than its factorization.

31321236040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10102 (or 10098 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 31321236040 its reverse (4063212313), we get a palindrome (35384448353).

The spelling of 31321236040 in words is "thirty-one billion, three hundred twenty-one million, two hundred thirty-six thousand, forty".