31311122001220 has 48 divisors (see below), whose sum is σ = 66503699982720. Its totient is φ = 12381936293376.

The previous prime is 31311122001179. The next prime is 31311122001281. The reversal of 31311122001220 is 2210022111313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11594250 + ... + 14037409.

It is an arithmetic number, because the mean of its divisors is an integer number (1385493749640).

Almost surely, 2^{31311122001220} is an apocalyptic number.

It is an amenable number.

31311122001220 is an abundant number, since it is smaller than the sum of its proper divisors (35192577981500).

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

31311122001220 is a wasteful number, since it uses less digits than its factorization.

31311122001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25632364 (or 25632362 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31311122001220 its reverse (2210022111313), we get a palindrome (33521144112533).

The spelling of 31311122001220 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-two million, one thousand, two hundred twenty".