1220403320231 has 4 divisors (see below), whose sum is σ = 1220431136592. Its totient is φ = 1220375503872.

The previous prime is 1220403320221. The next prime is 1220403320233. The reversal of 1220403320231 is 1320233040221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220403320231 - 2¹⁸ = 1220403058087 is a prime.

It is a super-2 number, since 2×1220403320231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220403320197 and 1220403320206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220403320233) 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, 13842266 + ... + 13930151.

It is an arithmetic number, because the mean of its divisors is an integer number (305107784148).

Almost surely, 2^{1220403320231} is an apocalyptic number.

1220403320231 is a deficient number, since it is larger than the sum of its proper divisors (27816361).

1220403320231 is an equidigital number, since it uses as much as digits as its factorization.

1220403320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27816360.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 1220403320231 its reverse (1320233040221), we get a palindrome (2540636360452).

The spelling of 1220403320231 in words is "one trillion, two hundred twenty billion, four hundred three million, three hundred twenty thousand, two hundred thirty-one".