1220331231001 has 4 divisors (see below), whose sum is σ = 1221185208100. Its totient is φ = 1219477253904.

The previous prime is 1220331230977. The next prime is 1220331231029. The reversal of 1220331231001 is 1001321330221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 191528769600 + 1028802461401 = 437640^2 + 1014299^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220331231001 - 2⁷ = 1220331230873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220331231001.

It is not an unprimeable number, because it can be changed into a prime (1220331231061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426986406 + ... + 426989263.

It is an arithmetic number, because the mean of its divisors is an integer number (305296302025).

Almost surely, 2^{1220331231001} is an apocalyptic number.

It is an amenable number.

1220331231001 is a deficient number, since it is larger than the sum of its proper divisors (853977099).

1220331231001 is an equidigital number, since it uses as much as digits as its factorization.

1220331231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853977098.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1220331231001 its reverse (1001321330221), we get a palindrome (2221652561222).

The spelling of 1220331231001 in words is "one trillion, two hundred twenty billion, three hundred thirty-one million, two hundred thirty-one thousand, one".