105023421 has 12 divisors (see below), whose sum is σ = 153779548. Its totient is φ = 69056064.

The previous prime is 105023419. The next prime is 105023437. The reversal of 105023421 is 124320501.

It can be written as a sum of positive squares in 2 ways, for example, as 31304025 + 73719396 = 5595^2 + 8586^2 .

It is not a de Polignac number, because 105023421 - 2¹ = 105023419 is a prime.

It is a super-2 number, since 2×105023421² = 22059837917086482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105023394 and 105023403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105023441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79270 + ... + 80583.

Almost surely, 2^105023421 is an apocalyptic number.

It is an amenable number.

105023421 is a deficient number, since it is larger than the sum of its proper divisors (48756127).

105023421 is a wasteful number, since it uses less digits than its factorization.

105023421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159932 (or 159929 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 105023421 is about 10248.0935300182. The cubic root of 105023421 is about 471.8044726019.

Adding to 105023421 its reverse (124320501), we get a palindrome (229343922).

The spelling of 105023421 in words is "one hundred five million, twenty-three thousand, four hundred twenty-one".