31821140086 has 4 divisors (see below), whose sum is σ = 47731710132. Its totient is φ = 15910570042.

The previous prime is 31821140033. The next prime is 31821140089. The reversal of 31821140086 is 68004112813.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31821140089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7955285020 + ... + 7955285023.

It is an arithmetic number, because the mean of its divisors is an integer number (11932927533).

Almost surely, 2^31821140086 is an apocalyptic number.

31821140086 is a deficient number, since it is larger than the sum of its proper divisors (15910570046).

31821140086 is a wasteful number, since it uses less digits than its factorization.

31821140086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15910570045.

The product of its (nonzero) digits is 9216, while the sum is 34.

Adding to 31821140086 its reverse (68004112813), we get a palindrome (99825252899).

The spelling of 31821140086 in words is "thirty-one billion, eight hundred twenty-one million, one hundred forty thousand, eighty-six".