1220402131131 has 4 divisors (see below), whose sum is σ = 1627202841512. Its totient is φ = 813601420752.

The previous prime is 1220402131099. The next prime is 1220402131141. The reversal of 1220402131131 is 1311312040221.

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

It is not a de Polignac number, because 1220402131131 - 2⁵ = 1220402131099 is a prime.

It is a super-2 number, since 2×1220402131131² (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 = 1220402131098 and 1220402131107.

It is not an unprimeable number, because it can be changed into a prime (1220402131141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203400355186 + ... + 203400355191.

It is an arithmetic number, because the mean of its divisors is an integer number (406800710378).

Almost surely, 2^{1220402131131} is an apocalyptic number.

1220402131131 is a deficient number, since it is larger than the sum of its proper divisors (406800710381).

1220402131131 is an equidigital number, since it uses as much as digits as its factorization.

1220402131131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406800710380.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1220402131131 its reverse (1311312040221), we get a palindrome (2531714171352).

The spelling of 1220402131131 in words is "one trillion, two hundred twenty billion, four hundred two million, one hundred thirty-one thousand, one hundred thirty-one".