31143310021 has 16 divisors (see below), whose sum is σ = 33265330560. Its totient is φ = 29054039040.

The previous prime is 31143309971. The next prime is 31143310027. The reversal of 31143310021 is 12001334113.

It is not a de Polignac number, because 31143310021 - 2¹¹ = 31143307973 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 (31143310027) 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, 2039005 + ... + 2054221.

It is an arithmetic number, because the mean of its divisors is an integer number (2079083160).

Almost surely, 2^31143310021 is an apocalyptic number.

It is an amenable number.

31143310021 is a deficient number, since it is larger than the sum of its proper divisors (2122020539).

31143310021 is a wasteful number, since it uses less digits than its factorization.

31143310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16284.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31143310021 its reverse (12001334113), we get a palindrome (43144644134).

The spelling of 31143310021 in words is "thirty-one billion, one hundred forty-three million, three hundred ten thousand, twenty-one".