31221331142 has 4 divisors (see below), whose sum is σ = 46831996716. Its totient is φ = 15610665570.

The previous prime is 31221331111. The next prime is 31221331153. The reversal of 31221331142 is 24113312213.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7805332784 + ... + 7805332787.

It is an arithmetic number, because the mean of its divisors is an integer number (11707999179).

Almost surely, 2^31221331142 is an apocalyptic number.

31221331142 is a deficient number, since it is larger than the sum of its proper divisors (15610665574).

31221331142 is a wasteful number, since it uses less digits than its factorization.

31221331142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15610665573.

The product of its digits is 864, while the sum is 23.

Adding to 31221331142 its reverse (24113312213), we get a palindrome (55334643355).

The spelling of 31221331142 in words is "thirty-one billion, two hundred twenty-one million, three hundred thirty-one thousand, one hundred forty-two".