2090518021 has 4 divisors (see below), whose sum is σ = 2095484044. Its totient is φ = 2085552000.

The previous prime is 2090518013. The next prime is 2090518037. The reversal of 2090518021 is 1208150902.

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 5225796 + 2085292225 = 2286^2 + 45665^2 .

It is a cyclic number.

It is not a de Polignac number, because 2090518021 - 2³ = 2090518013 is a prime.

It is a super-2 number, since 2×2090518021² = 8740531192251512882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2090518091) 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, 2482380 + ... + 2483221.

It is an arithmetic number, because the mean of its divisors is an integer number (523871011).

Almost surely, 2^2090518021 is an apocalyptic number.

It is an amenable number.

2090518021 is a deficient number, since it is larger than the sum of its proper divisors (4966023).

2090518021 is an equidigital number, since it uses as much as digits as its factorization.

2090518021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966022.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 2090518021 is about 45722.1830296848. The cubic root of 2090518021 is about 1278.6488878440.

Adding to 2090518021 its reverse (1208150902), we get a palindrome (3298668923).

The spelling of 2090518021 in words is "two billion, ninety million, five hundred eighteen thousand, twenty-one".