31221030140020 has 96 divisors (see below), whose sum is σ = 75103801049088. Its totient is φ = 10679599066752.

The previous prime is 31221030140011. The next prime is 31221030140021. The reversal of 31221030140020 is 2004103012213.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31221030140020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221030140021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 469717309 + ... + 469783771.

It is an arithmetic number, because the mean of its divisors is an integer number (782331260928).

Almost surely, 2^{31221030140020} is an apocalyptic number.

It is an amenable number.

31221030140020 is an abundant number, since it is smaller than the sum of its proper divisors (43882770909068).

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

31221030140020 is a wasteful number, since it uses less digits than its factorization.

31221030140020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74189 (or 74187 counting only the distinct ones).

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

Adding to 31221030140020 its reverse (2004103012213), we get a palindrome (33225133152233).

The spelling of 31221030140020 in words is "thirty-one trillion, two hundred twenty-one billion, thirty million, one hundred forty thousand, twenty".