105721051 has 2 divisors, whose sum is σ = 105721052. Its totient is φ = 105721050.

The previous prime is 105721027. The next prime is 105721103. The reversal of 105721051 is 150127501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 105721051 - 2⁵ = 105721019 is a prime.

It is a super-2 number, since 2×105721051² = 22353881249089202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (105721151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52860525 + 52860526.

It is an arithmetic number, because the mean of its divisors is an integer number (52860526).

Almost surely, 2^105721051 is an apocalyptic number.

105721051 is a deficient number, since it is larger than the sum of its proper divisors (1).

105721051 is an equidigital number, since it uses as much as digits as its factorization.

105721051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 105721051 is about 10282.0742557132. The cubic root of 105721051 is about 472.8468395790.

Adding to 105721051 its reverse (150127501), we get a palindrome (255848552).

The spelling of 105721051 in words is "one hundred five million, seven hundred twenty-one thousand, fifty-one".