31540221340 has 12 divisors (see below), whose sum is σ = 66234464856. Its totient is φ = 12616088528.

The previous prime is 31540221289. The next prime is 31540221347. The reversal of 31540221340 is 4312204513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31540221347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788505514 + ... + 788505553.

It is an arithmetic number, because the mean of its divisors is an integer number (5519538738).

Almost surely, 2^31540221340 is an apocalyptic number.

It is an amenable number.

31540221340 is an abundant number, since it is smaller than the sum of its proper divisors (34694243516).

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

31540221340 is a wasteful number, since it uses less digits than its factorization.

31540221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577011076 (or 1577011074 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 31540221340 its reverse (4312204513), we get a palindrome (35852425853).

The spelling of 31540221340 in words is "thirty-one billion, five hundred forty million, two hundred twenty-one thousand, three hundred forty".