31421242143 has 16 divisors (see below), whose sum is σ = 46559852640. Its totient is φ = 20943055872.

The previous prime is 31421242133. The next prime is 31421242147. The reversal of 31421242143 is 34124212413.

31421242143 is a `hidden beast` number, since 3 + 1 + 421 + 24 + 214 + 3 = 666.

It is not a de Polignac number, because 31421242143 - 2¹² = 31421238047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421242147) 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, 9055 + ... + 250847.

It is an arithmetic number, because the mean of its divisors is an integer number (2909990790).

Almost surely, 2^31421242143 is an apocalyptic number.

31421242143 is a deficient number, since it is larger than the sum of its proper divisors (15138610497).

31421242143 is a wasteful number, since it uses less digits than its factorization.

31421242143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246615 (or 246609 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 31421242143 its reverse (34124212413), we get a palindrome (65545454556).

The spelling of 31421242143 in words is "thirty-one billion, four hundred twenty-one million, two hundred forty-two thousand, one hundred forty-three".