1231001220220 has 48 divisors (see below), whose sum is σ = 2609440344000. Its totient is φ = 487786337280.

The previous prime is 1231001220191. The next prime is 1231001220227. The reversal of 1231001220220 is 220221001321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1231001220194 and 1231001220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231001220227) 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, 236100 + ... + 1586740.

It is an arithmetic number, because the mean of its divisors is an integer number (54363340500).

Almost surely, 2^{1231001220220} is an apocalyptic number.

1231001220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231001220220 is an abundant number, since it is smaller than the sum of its proper divisors (1378439123780).

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

1231001220220 is a wasteful number, since it uses less digits than its factorization.

1231001220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351078 (or 1351076 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1231001220220 its reverse (220221001321), we get a palindrome (1451222221541).

The spelling of 1231001220220 in words is "one trillion, two hundred thirty-one billion, one million, two hundred twenty thousand, two hundred twenty".