2730120021 has 6 divisors (see below), whose sum is σ = 3943506710. Its totient is φ = 1820080008.

The previous prime is 2730120011. The next prime is 2730120053. The reversal of 2730120021 is 1200210372.

2730120021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2388276900 + 341843121 = 48870^2 + 18489^2 .

It is not a de Polignac number, because 2730120021 - 2¹⁷ = 2729988949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2730119976 and 2730120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2730120011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151673326 + ... + 151673343.

Almost surely, 2^2730120021 is an apocalyptic number.

It is an amenable number.

2730120021 is a deficient number, since it is larger than the sum of its proper divisors (1213386689).

2730120021 is a wasteful number, since it uses less digits than its factorization.

2730120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303346675 (or 303346672 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 2730120021 is about 52250.5504372920. The cubic root of 2730120021 is about 1397.6354680224.

Adding to 2730120021 its reverse (1200210372), we get a palindrome (3930330393).

The spelling of 2730120021 in words is "two billion, seven hundred thirty million, one hundred twenty thousand, twenty-one".