31232144021 has 8 divisors (see below), whose sum is σ = 34186004664. Its totient is φ = 28357053120.

The previous prime is 31232144017. The next prime is 31232144057. The reversal of 31232144021 is 12044123213.

It can be written as a sum of positive squares in 4 ways, for example, as 6923904100 + 24308239921 = 83210^2 + 155911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31232144021 - 2² = 31232144017 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 (31232144011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19691606 + ... + 19693191.

It is an arithmetic number, because the mean of its divisors is an integer number (4273250583).

Almost surely, 2^31232144021 is an apocalyptic number.

It is an amenable number.

31232144021 is a deficient number, since it is larger than the sum of its proper divisors (2953860643).

31232144021 is a wasteful number, since it uses less digits than its factorization.

31232144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39384871.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31232144021 its reverse (12044123213), we get a palindrome (43276267234).

The spelling of 31232144021 in words is "thirty-one billion, two hundred thirty-two million, one hundred forty-four thousand, twenty-one".