1220121032131 has 4 divisors (see below), whose sum is σ = 1262194171200. Its totient is φ = 1178047893064.

The previous prime is 1220121032129. The next prime is 1220121032161. The reversal of 1220121032131 is 1312301210221.

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 1220121032131 - 2¹ = 1220121032129 is a prime.

It is a super-2 number, since 2×1220121032131² (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 = 1220121032099 and 1220121032108.

It is not an unprimeable number, because it can be changed into a prime (1220121032111) 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, 21036569491 + ... + 21036569548.

It is an arithmetic number, because the mean of its divisors is an integer number (315548542800).

Almost surely, 2^{1220121032131} is an apocalyptic number.

1220121032131 is a deficient number, since it is larger than the sum of its proper divisors (42073139069).

1220121032131 is an equidigital number, since it uses as much as digits as its factorization.

1220121032131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42073139068.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1220121032131 its reverse (1312301210221), we get a palindrome (2532422242352).

The spelling of 1220121032131 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, thirty-two thousand, one hundred thirty-one".