108205021 has 2 divisors, whose sum is σ = 108205022. Its totient is φ = 108205020.

The previous prime is 108205001. The next prime is 108205049. The reversal of 108205021 is 120502801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108056025 + 148996 = 10395^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 108205021 - 2⁵ = 108204989 is a prime.

It is a super-2 number, since 2×108205021² = 23416653139220882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 108205021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108205001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54102510 + 54102511.

It is an arithmetic number, because the mean of its divisors is an integer number (54102511).

Almost surely, 2^108205021 is an apocalyptic number.

It is an amenable number.

108205021 is a deficient number, since it is larger than the sum of its proper divisors (1).

108205021 is an equidigital number, since it uses as much as digits as its factorization.

108205021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 108205021 is about 10402.1642459634. The cubic root of 108205021 is about 476.5214682100.

Adding to 108205021 its reverse (120502801), we get a palindrome (228707822).

The spelling of 108205021 in words is "one hundred eight million, two hundred five thousand, twenty-one".