2750021 has 2 divisors, whose sum is σ = 2750022. Its totient is φ = 2750020.

The previous prime is 2749991. The next prime is 2750029. The reversal of 2750021 is 1200572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 532900 = 1489^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2750021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2750029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1375010 + 1375011.

It is an arithmetic number, because the mean of its divisors is an integer number (1375011).

2^2750021 is an apocalyptic number.

It is an amenable number.

2750021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2750021 is an equidigital number, since it uses as much as digits as its factorization.

2750021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 2750021 is about 1658.3187269038. The cubic root of 2750021 is about 140.1023231550.

Adding to 2750021 its reverse (1200572), we get a palindrome (3950593).

The spelling of 2750021 in words is "two million, seven hundred fifty thousand, twenty-one".