105406621 has 4 divisors (see below), whose sum is σ = 105739452. Its totient is φ = 105073792.

The previous prime is 105406591. The next prime is 105406633. The reversal of 105406621 is 126604501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126604501 = 59 ⋅2145839.

It can be written as a sum of positive squares in 2 ways, for example, as 51912025 + 53494596 = 7205^2 + 7314^2 .

It is a cyclic number.

It is not a de Polignac number, because 105406621 - 2¹³ = 105398429 is a prime.

It is a super-2 number, since 2×105406621² = 22221111501275282, which 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 (105406421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165940 + ... + 166573.

It is an arithmetic number, because the mean of its divisors is an integer number (26434863).

Almost surely, 2^105406621 is an apocalyptic number.

It is an amenable number.

105406621 is a deficient number, since it is larger than the sum of its proper divisors (332831).

105406621 is an equidigital number, since it uses as much as digits as its factorization.

105406621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332830.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 105406621 is about 10266.7726672017. The cubic root of 105406621 is about 472.3776019945.

It can be divided in two parts, 10540 and 6621, that added together give a square (17161 = 131²).

The spelling of 105406621 in words is "one hundred five million, four hundred six thousand, six hundred twenty-one".