105252121 has 4 divisors (see below), whose sum is σ = 113348452. Its totient is φ = 97155792.

The previous prime is 105252113. The next prime is 105252131. The reversal of 105252121 is 121252501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38192400 + 67059721 = 6180^2 + 8189^2 .

It is a cyclic number.

It is not a de Polignac number, because 105252121 - 2³ = 105252113 is a prime.

It is a super-2 number, since 2×105252121² = 22156017949997282, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105252101) 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, 4048146 + ... + 4048171.

It is an arithmetic number, because the mean of its divisors is an integer number (28337113).

Almost surely, 2^105252121 is an apocalyptic number.

It is an amenable number.

105252121 is a deficient number, since it is larger than the sum of its proper divisors (8096331).

105252121 is an equidigital number, since it uses as much as digits as its factorization.

105252121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8096330.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 105252121 is about 10259.2456350357. The cubic root of 105252121 is about 472.1466929495.

The spelling of 105252121 in words is "one hundred five million, two hundred fifty-two thousand, one hundred twenty-one".