421052121121 has 2 divisors, whose sum is σ = 421052121122. Its totient is φ = 421052121120.

The previous prime is 421052121037. The next prime is 421052121137. The reversal of 421052121121 is 121121250124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420915488400 + 136632721 = 648780^2 + 11689^2 .

It is a cyclic number.

It is not a de Polignac number, because 421052121121 - 2¹¹ = 421052119073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421052121092 and 421052121101.

It is not a weakly prime, because it can be changed into another prime (421056121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210526060560 + 210526060561.

It is an arithmetic number, because the mean of its divisors is an integer number (210526060561).

Almost surely, 2^421052121121 is an apocalyptic number.

It is an amenable number.

421052121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421052121121 is an equidigital number, since it uses as much as digits as its factorization.

421052121121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 421052121121 its reverse (121121250124), we get a palindrome (542173371245).

The spelling of 421052121121 in words is "four hundred twenty-one billion, fifty-two million, one hundred twenty-one thousand, one hundred twenty-one".