31241213020 has 24 divisors (see below), whose sum is σ = 67002433344. Its totient is φ = 12230602176.

The previous prime is 31241213009. The next prime is 31241213027. The reversal of 31241213020 is 2031214213.

It is a happy number.

It is a super-2 number, since 2×31241213020² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31241213027) 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, 16616727 + ... + 16618606.

It is an arithmetic number, because the mean of its divisors is an integer number (2791768056).

Almost surely, 2^31241213020 is an apocalyptic number.

It is an amenable number.

31241213020 is an abundant number, since it is smaller than the sum of its proper divisors (35761220324).

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

31241213020 is a wasteful number, since it uses less digits than its factorization.

31241213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33235389 (or 33235387 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31241213020 its reverse (2031214213), we get a palindrome (33272427233).

The spelling of 31241213020 in words is "thirty-one billion, two hundred forty-one million, two hundred thirteen thousand, twenty".