31421320040 has 32 divisors (see below), whose sum is σ = 77125059360. Its totient is φ = 11425934400.

The previous prime is 31421320033. The next prime is 31421320061. The reversal of 31421320040 is 4002312413.

It is a super-2 number, since 2×31421320040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31421319994 and 31421320021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35705606 + ... + 35706485.

It is an arithmetic number, because the mean of its divisors is an integer number (2410158105).

Almost surely, 2^31421320040 is an apocalyptic number.

It is an amenable number.

31421320040 is an abundant number, since it is smaller than the sum of its proper divisors (45703739320).

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

31421320040 is a wasteful number, since it uses less digits than its factorization.

31421320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71412113 (or 71412109 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31421320040 its reverse (4002312413), we get a palindrome (35423632453).

The spelling of 31421320040 in words is "thirty-one billion, four hundred twenty-one million, three hundred twenty thousand, forty".