1310221231220 has 24 divisors (see below), whose sum is σ = 3001597730208. Its totient is φ = 476444084000.

The previous prime is 1310221231183. The next prime is 1310221231223. The reversal of 1310221231220 is 221321220131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1310221231192 and 1310221231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310221231223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2977775306 + ... + 2977775745.

It is an arithmetic number, because the mean of its divisors is an integer number (125066572092).

Almost surely, 2^{1310221231220} is an apocalyptic number.

1310221231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1310221231220 is an abundant number, since it is smaller than the sum of its proper divisors (1691376498988).

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

1310221231220 is a wasteful number, since it uses less digits than its factorization.

1310221231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5955551071 (or 5955551069 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1310221231220 its reverse (221321220131), we get a palindrome (1531542451351).

The spelling of 1310221231220 in words is "one trillion, three hundred ten billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty".