31213124421040 has 80 divisors (see below), whose sum is σ = 76455702950400. Its totient is φ = 11817960327936.

The previous prime is 31213124421023. The next prime is 31213124421041. The reversal of 31213124421040 is 4012442131213.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31213124421040² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31213124421041) 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, 7060680 + ... + 10596199.

It is an arithmetic number, because the mean of its divisors is an integer number (955696286880).

Almost surely, 2^{31213124421040} is an apocalyptic number.

It is an amenable number.

31213124421040 is an abundant number, since it is smaller than the sum of its proper divisors (45242578529360).

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

31213124421040 is a wasteful number, since it uses less digits than its factorization.

31213124421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17658074 (or 17658068 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 31213124421040 its reverse (4012442131213), we get a palindrome (35225566552253).

The spelling of 31213124421040 in words is "thirty-one trillion, two hundred thirteen billion, one hundred twenty-four million, four hundred twenty-one thousand, forty".