368106821 has 4 divisors (see below), whose sum is σ = 378055692. Its totient is φ = 358157952.

The previous prime is 368106799. The next prime is 368106829. The reversal of 368106821 is 128601863.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 330148900 + 37957921 = 18170^2 + 6161^2 .

It is a cyclic number.

It is not a de Polignac number, because 368106821 - 2¹⁸ = 367844677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (368106829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4974380 + ... + 4974453.

It is an arithmetic number, because the mean of its divisors is an integer number (94513923).

Almost surely, 2^368106821 is an apocalyptic number.

It is an amenable number.

368106821 is a deficient number, since it is larger than the sum of its proper divisors (9948871).

368106821 is an equidigital number, since it uses as much as digits as its factorization.

368106821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9948870.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 368106821 is about 19186.1101060116. The cubic root of 368106821 is about 716.6789053135.

The spelling of 368106821 in words is "three hundred sixty-eight million, one hundred six thousand, eight hundred twenty-one".