31201321424 has 80 divisors (see below), whose sum is σ = 74712718080. Its totient is φ = 12292024320.

The previous prime is 31201321423. The next prime is 31201321427. The reversal of 31201321424 is 42412310213.

It is a super-2 number, since 2×31201321424² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31201321424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201321421) 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, 306437 + ... + 395355.

It is an arithmetic number, because the mean of its divisors is an integer number (933908976).

Almost surely, 2^31201321424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31201321424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37356359040).

31201321424 is an abundant number, since it is smaller than the sum of its proper divisors (43511396656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31201321424 is a wasteful number, since it uses less digits than its factorization.

31201321424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89188 (or 89182 counting only the distinct ones).

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

Adding to 31201321424 its reverse (42412310213), we get a palindrome (73613631637).

The spelling of 31201321424 in words is "thirty-one billion, two hundred one million, three hundred twenty-one thousand, four hundred twenty-four".