31221678742 has 8 divisors (see below), whose sum is σ = 47067858000. Its totient is φ = 15532392744.

The previous prime is 31221678713. The next prime is 31221678743. The reversal of 31221678742 is 24787612213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221678743) 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, 39222817 + ... + 39223612.

It is an arithmetic number, because the mean of its divisors is an integer number (5883482250).

Almost surely, 2^31221678742 is an apocalyptic number.

31221678742 is a deficient number, since it is larger than the sum of its proper divisors (15846179258).

31221678742 is a wasteful number, since it uses less digits than its factorization.

31221678742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78446630.

The product of its digits is 225792, while the sum is 43.

The spelling of 31221678742 in words is "thirty-one billion, two hundred twenty-one million, six hundred seventy-eight thousand, seven hundred forty-two".