105698921 has 2 divisors, whose sum is σ = 105698922. Its totient is φ = 105698920.

The previous prime is 105698903. The next prime is 105698947. The reversal of 105698921 is 129896501.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84640000 + 21058921 = 9200^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 105698921 - 2¹⁴ = 105682537 is a prime.

It is a super-2 number, since 2×105698921² = 22344523801128482, which contains 22 as substring.

It is a Sophie Germain prime.

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

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (105698321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52849460 + 52849461.

It is an arithmetic number, because the mean of its divisors is an integer number (52849461).

Almost surely, 2^105698921 is an apocalyptic number.

It is an amenable number.

105698921 is a deficient number, since it is larger than the sum of its proper divisors (1).

105698921 is an equidigital number, since it uses as much as digits as its factorization.

105698921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 105698921 is about 10280.9980546638. The cubic root of 105698921 is about 472.8138444764.

The spelling of 105698921 in words is "one hundred five million, six hundred ninety-eight thousand, nine hundred twenty-one".