105919421 has 2 divisors, whose sum is σ = 105919422. Its totient is φ = 105919420.

The previous prime is 105919409. The next prime is 105919427. The reversal of 105919421 is 124919501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 48372025 = 7586^2 + 6955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105919421 is a prime.

It is a super-2 number, since 2×105919421² = 22437847489950482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105919427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52959710 + 52959711.

It is an arithmetic number, because the mean of its divisors is an integer number (52959711).

Almost surely, 2^105919421 is an apocalyptic number.

It is an amenable number.

105919421 is a deficient number, since it is larger than the sum of its proper divisors (1).

105919421 is an equidigital number, since it uses as much as digits as its factorization.

105919421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 105919421 is about 10291.7161348339. The cubic root of 105919421 is about 473.1423973111.

The spelling of 105919421 in words is "one hundred five million, nine hundred nineteen thousand, four hundred twenty-one".