105788021 has 2 divisors, whose sum is σ = 105788022. Its totient is φ = 105788020.

The previous prime is 105787999. The next prime is 105788071. The reversal of 105788021 is 120887501.

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., 92428996 + 13359025 = 9614^2 + 3655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105788021 is a prime.

It is a super-2 number, since 2×105788021² = 22382210774192882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105788071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52894010 + 52894011.

It is an arithmetic number, because the mean of its divisors is an integer number (52894011).

Almost surely, 2^105788021 is an apocalyptic number.

It is an amenable number.

105788021 is a deficient number, since it is larger than the sum of its proper divisors (1).

105788021 is an equidigital number, since it uses as much as digits as its factorization.

105788021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 105788021 is about 10285.3303787482. The cubic root of 105788021 is about 472.9466616057.

The spelling of 105788021 in words is "one hundred five million, seven hundred eighty-eight thousand, twenty-one".