31421244143 has 16 divisors (see below), whose sum is σ = 34194998880. Its totient is φ = 28761216000.

The previous prime is 31421244121. The next prime is 31421244157. The reversal of 31421244143 is 34144212413.

It is a cyclic number.

It is not a de Polignac number, because 31421244143 - 2⁶ = 31421244079 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 (31421244443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77933 + ... + 262518.

It is an arithmetic number, because the mean of its divisors is an integer number (2137187430).

Almost surely, 2^31421244143 is an apocalyptic number.

31421244143 is a deficient number, since it is larger than the sum of its proper divisors (2773754737).

31421244143 is a wasteful number, since it uses less digits than its factorization.

31421244143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340618.

The product of its digits is 9216, while the sum is 29.

Adding to 31421244143 its reverse (34144212413), we get a palindrome (65565456556).

The spelling of 31421244143 in words is "thirty-one billion, four hundred twenty-one million, two hundred forty-four thousand, one hundred forty-three".