105420405421 has 2 divisors, whose sum is σ = 105420405422. Its totient is φ = 105420405420.

The previous prime is 105420405413. The next prime is 105420405443. The reversal of 105420405421 is 124504024501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104015280196 + 1405125225 = 322514^2 + 37485^2 .

It is an emirp because it is prime and its reverse (124504024501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105420405421 - 2³ = 105420405413 is a prime.

It is a super-2 number, since 2×105420405421² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105420405421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105420205421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52710202710 + 52710202711.

It is an arithmetic number, because the mean of its divisors is an integer number (52710202711).

Almost surely, 2^105420405421 is an apocalyptic number.

It is an amenable number.

105420405421 is a deficient number, since it is larger than the sum of its proper divisors (1).

105420405421 is an equidigital number, since it uses as much as digits as its factorization.

105420405421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 105420405421 its reverse (124504024501), we get a palindrome (229924429922).

The spelling of 105420405421 in words is "one hundred five billion, four hundred twenty million, four hundred five thousand, four hundred twenty-one".