31431421242 has 48 divisors (see below), whose sum is σ = 73531680768. Its totient is φ = 9645927840.

The previous prime is 31431421237. The next prime is 31431421283. The reversal of 31431421242 is 24212413413.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85734 + ... + 264977.

It is an arithmetic number, because the mean of its divisors is an integer number (1531910016).

Almost surely, 2^31431421242 is an apocalyptic number.

31431421242 is an abundant number, since it is smaller than the sum of its proper divisors (42100259526).

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

31431421242 is a wasteful number, since it uses less digits than its factorization.

31431421242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351115 (or 351112 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 31431421242 its reverse (24212413413), we get a palindrome (55643834655).

The spelling of 31431421242 in words is "thirty-one billion, four hundred thirty-one million, four hundred twenty-one thousand, two hundred forty-two".