105655021 has 2 divisors, whose sum is σ = 105655022. Its totient is φ = 105655020.

The previous prime is 105655007. The next prime is 105655049. The reversal of 105655021 is 120556501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93334921 + 12320100 = 9661^2 + 3510^2 .

It is a cyclic number.

It is not a de Polignac number, because 105655021 - 2⁹ = 105654509 is a prime.

It is a super-2 number, since 2×105655021² = 22325966925020882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105655001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52827510 + 52827511.

It is an arithmetic number, because the mean of its divisors is an integer number (52827511).

Almost surely, 2^105655021 is an apocalyptic number.

It is an amenable number.

105655021 is a deficient number, since it is larger than the sum of its proper divisors (1).

105655021 is an equidigital number, since it uses as much as digits as its factorization.

105655021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 105655021 is about 10278.8628262080. The cubic root of 105655021 is about 472.7483773873.

The spelling of 105655021 in words is "one hundred five million, six hundred fifty-five thousand, twenty-one".