31351134221 has 8 divisors (see below), whose sum is σ = 34419081504. Its totient is φ = 28319494320.

The previous prime is 31351134151. The next prime is 31351134229. The reversal of 31351134221 is 12243115313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31351134221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31351134229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9075035 + ... + 9078488.

It is an arithmetic number, because the mean of its divisors is an integer number (4302385188).

Almost surely, 2^31351134221 is an apocalyptic number.

It is an amenable number.

31351134221 is a deficient number, since it is larger than the sum of its proper divisors (3067947283).

31351134221 is a wasteful number, since it uses less digits than its factorization.

31351134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18153691.

The product of its digits is 2160, while the sum is 26.

Adding to 31351134221 its reverse (12243115313), we get a palindrome (43594249534).

The spelling of 31351134221 in words is "thirty-one billion, three hundred fifty-one million, one hundred thirty-four thousand, two hundred twenty-one".