105239621 has 2 divisors, whose sum is σ = 105239622. Its totient is φ = 105239620.

The previous prime is 105239597. The next prime is 105239633. The reversal of 105239621 is 126932501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103022500 + 2217121 = 10150^2 + 1489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105239621 is a prime.

It is a super-2 number, since 2×105239621² = 22150755656447282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105239681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52619810 + 52619811.

It is an arithmetic number, because the mean of its divisors is an integer number (52619811).

Almost surely, 2^105239621 is an apocalyptic number.

It is an amenable number.

105239621 is a deficient number, since it is larger than the sum of its proper divisors (1).

105239621 is an equidigital number, since it uses as much as digits as its factorization.

105239621 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 29.

The square root of 105239621 is about 10258.6364103618. The cubic root of 105239621 is about 472.1280011098.

The spelling of 105239621 in words is "one hundred five million, two hundred thirty-nine thousand, six hundred twenty-one".