31212040143 has 4 divisors (see below), whose sum is σ = 41616053528. Its totient is φ = 20808026760.

The previous prime is 31212040127. The next prime is 31212040147. The reversal of 31212040143 is 34104021213.

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

It is not a de Polignac number, because 31212040143 - 2⁴ = 31212040127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212040147) 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, 5202006688 + ... + 5202006693.

It is an arithmetic number, because the mean of its divisors is an integer number (10404013382).

Almost surely, 2^31212040143 is an apocalyptic number.

31212040143 is a deficient number, since it is larger than the sum of its proper divisors (10404013385).

31212040143 is a wasteful number, since it uses less digits than its factorization.

31212040143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404013384.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31212040143 its reverse (34104021213), we get a palindrome (65316061356).

The spelling of 31212040143 in words is "thirty-one billion, two hundred twelve million, forty thousand, one hundred forty-three".