105212399 has 4 divisors (see below), whose sum is σ = 106995720. Its totient is φ = 103429080.

The previous prime is 105212383. The next prime is 105212479. The reversal of 105212399 is 993212501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993212501 = 6577 ⋅151013.

It is a cyclic number.

It is not a de Polignac number, because 105212399 - 2⁴ = 105212383 is a prime.

It is a super-2 number, since 2×105212399² = 22139297806670402, 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 (105212369) 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, 891572 + ... + 891689.

It is an arithmetic number, because the mean of its divisors is an integer number (26748930).

Almost surely, 2^105212399 is an apocalyptic number.

105212399 is a deficient number, since it is larger than the sum of its proper divisors (1783321).

105212399 is an equidigital number, since it uses as much as digits as its factorization.

105212399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783320.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 105212399 is about 10257.3095400305. The cubic root of 105212399 is about 472.0872896470.

The spelling of 105212399 in words is "one hundred five million, two hundred twelve thousand, three hundred ninety-nine".