105423001421 has 4 divisors (see below), whose sum is σ = 105431922492. Its totient is φ = 105414080352.

The previous prime is 105423001379. The next prime is 105423001423. The reversal of 105423001421 is 124100324501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124100324501 = 2297 ⋅54027133.

It can be written as a sum of positive squares in 2 ways, for example, as 94547640196 + 10875361225 = 307486^2 + 104285^2 .

It is a cyclic number.

It is not a de Polignac number, because 105423001421 - 2²⁶ = 105355892557 is a prime.

It is a super-2 number, since 2×105423001421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105423001423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4442786 + ... + 4466451.

It is an arithmetic number, because the mean of its divisors is an integer number (26357980623).

Almost surely, 2^105423001421 is an apocalyptic number.

It is an amenable number.

105423001421 is a deficient number, since it is larger than the sum of its proper divisors (8921071).

105423001421 is an equidigital number, since it uses as much as digits as its factorization.

105423001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8921070.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 105423001421 its reverse (124100324501), we get a palindrome (229523325922).

The spelling of 105423001421 in words is "one hundred five billion, four hundred twenty-three million, one thousand, four hundred twenty-one".