421253113531 has 2 divisors, whose sum is σ = 421253113532. Its totient is φ = 421253113530.

The previous prime is 421253113483. The next prime is 421253113537. The reversal of 421253113531 is 135311352124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421253113531 - 2¹⁷ = 421252982459 is a prime.

It is a super-3 number, since 3×421253113531³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 421253113493 and 421253113502.

It is not a weakly prime, because it can be changed into another prime (421253113537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210626556765 + 210626556766.

It is an arithmetic number, because the mean of its divisors is an integer number (210626556766).

Almost surely, 2^421253113531 is an apocalyptic number.

421253113531 is a deficient number, since it is larger than the sum of its proper divisors (1).

421253113531 is an equidigital number, since it uses as much as digits as its factorization.

421253113531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

Adding to 421253113531 its reverse (135311352124), we get a palindrome (556564465655).

The spelling of 421253113531 in words is "four hundred twenty-one billion, two hundred fifty-three million, one hundred thirteen thousand, five hundred thirty-one".