105212251 has 4 divisors (see below), whose sum is σ = 106937104. Its totient is φ = 103487400.

The previous prime is 105212249. The next prime is 105212299. The reversal of 105212251 is 152212501.

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

It is a cyclic number.

It is not a de Polignac number, because 105212251 - 2¹ = 105212249 is a prime.

It is a super-2 number, since 2×105212251² = 22139235520974002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105212221) 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, 862335 + ... + 862456.

It is an arithmetic number, because the mean of its divisors is an integer number (26734276).

Almost surely, 2^105212251 is an apocalyptic number.

105212251 is a deficient number, since it is larger than the sum of its proper divisors (1724853).

105212251 is an equidigital number, since it uses as much as digits as its factorization.

105212251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724852.

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

The square root of 105212251 is about 10257.3023256605. The cubic root of 105212251 is about 472.0870682886.

Adding to 105212251 its reverse (152212501), we get a palindrome (257424752).

The spelling of 105212251 in words is "one hundred five million, two hundred twelve thousand, two hundred fifty-one".