31143140421 has 16 divisors (see below), whose sum is σ = 41586623424. Its totient is φ = 20730904064.

The previous prime is 31143140417. The next prime is 31143140437. The reversal of 31143140421 is 12404134113.

It is a cyclic number.

It is not a de Polignac number, because 31143140421 - 2² = 31143140417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31143140391 and 31143140400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143140411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8608405 + ... + 8612021.

It is an arithmetic number, because the mean of its divisors is an integer number (2599163964).

Almost surely, 2^31143140421 is an apocalyptic number.

It is an amenable number.

31143140421 is a deficient number, since it is larger than the sum of its proper divisors (10443483003).

31143140421 is a wasteful number, since it uses less digits than its factorization.

31143140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31143140421 its reverse (12404134113), we get a palindrome (43547274534).

The spelling of 31143140421 in words is "thirty-one billion, one hundred forty-three million, one hundred forty thousand, four hundred twenty-one".