421220131121 has 2 divisors, whose sum is σ = 421220131122. Its totient is φ = 421220131120.

The previous prime is 421220131099. The next prime is 421220131169. The reversal of 421220131121 is 121131022124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419042602225 + 2177528896 = 647335^2 + 46664^2 .

It is a cyclic number.

It is not a de Polignac number, because 421220131121 - 2¹⁸ = 421219868977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 421220131093 and 421220131102.

It is not a weakly prime, because it can be changed into another prime (421220131421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210610065560 + 210610065561.

It is an arithmetic number, because the mean of its divisors is an integer number (210610065561).

Almost surely, 2^421220131121 is an apocalyptic number.

It is an amenable number.

421220131121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421220131121 is an equidigital number, since it uses as much as digits as its factorization.

421220131121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 421220131121 its reverse (121131022124), we get a palindrome (542351153245).

The spelling of 421220131121 in words is "four hundred twenty-one billion, two hundred twenty million, one hundred thirty-one thousand, one hundred twenty-one".