421321134121 has 2 divisors, whose sum is σ = 421321134122. Its totient is φ = 421321134120.

The previous prime is 421321134109. The next prime is 421321134139. The reversal of 421321134121 is 121431123124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366431672896 + 54889461225 = 605336^2 + 234285^2 .

It is a cyclic number.

It is not a de Polignac number, because 421321134121 - 2²¹ = 421319036969 is a prime.

It is a super-2 number, since 2×421321134121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421321134821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210660567060 + 210660567061.

It is an arithmetic number, because the mean of its divisors is an integer number (210660567061).

Almost surely, 2^421321134121 is an apocalyptic number.

It is an amenable number.

421321134121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421321134121 is an equidigital number, since it uses as much as digits as its factorization.

421321134121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

Adding to 421321134121 its reverse (121431123124), we get a palindrome (542752257245).

The spelling of 421321134121 in words is "four hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-four thousand, one hundred twenty-one".