105520421 has 2 divisors, whose sum is σ = 105520422. Its totient is φ = 105520420.

The previous prime is 105520399. The next prime is 105520451. The reversal of 105520421 is 124025501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79459396 + 26061025 = 8914^2 + 5105^2 .

It is an emirp because it is prime and its reverse (124025501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105520421 - 2¹⁰ = 105519397 is a prime.

It is a super-2 number, since 2×105520421² = 22269118496034482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 105520393 and 105520402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105520451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52760210 + 52760211.

It is an arithmetic number, because the mean of its divisors is an integer number (52760211).

Almost surely, 2^105520421 is an apocalyptic number.

It is an amenable number.

105520421 is a deficient number, since it is larger than the sum of its proper divisors (1).

105520421 is an equidigital number, since it uses as much as digits as its factorization.

105520421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 105520421 is about 10272.3133227136. The cubic root of 105520421 is about 472.5475383056.

Adding to 105520421 its reverse (124025501), we get a palindrome (229545922).

The spelling of 105520421 in words is "one hundred five million, five hundred twenty thousand, four hundred twenty-one".