1331323011220 has 48 divisors (see below), whose sum is σ = 2821832133120. Its totient is φ = 527567976576.

The previous prime is 1331323011091. The next prime is 1331323011229. The reversal of 1331323011220 is 221103231331.

It is a junction number, because it is equal to n+sod(n) for n = 1331323011191 and 1331323011200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331323011229) 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, 16621789 + ... + 16701691.

It is an arithmetic number, because the mean of its divisors is an integer number (58788169440).

Almost surely, 2^{1331323011220} is an apocalyptic number.

1331323011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331323011220 is an abundant number, since it is smaller than the sum of its proper divisors (1490509121900).

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

1331323011220 is a wasteful number, since it uses less digits than its factorization.

1331323011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87664 (or 87662 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1331323011220 its reverse (221103231331), we get a palindrome (1552426242551).

The spelling of 1331323011220 in words is "one trillion, three hundred thirty-one billion, three hundred twenty-three million, eleven thousand, two hundred twenty".