2750666021 has 2 divisors, whose sum is σ = 2750666022. Its totient is φ = 2750666020.

The previous prime is 2750665999. The next prime is 2750666029. The reversal of 2750666021 is 1206660572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2640520996 + 110145025 = 51386^2 + 10495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2750666021 - 2²⁶ = 2683557157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2750666029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1375333010 + 1375333011.

It is an arithmetic number, because the mean of its divisors is an integer number (1375333011).

Almost surely, 2^2750666021 is an apocalyptic number.

It is an amenable number.

2750666021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2750666021 is an equidigital number, since it uses as much as digits as its factorization.

2750666021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 2750666021 is about 52446.7922851341. The cubic root of 2750666021 is about 1401.1327602609.

The spelling of 2750666021 in words is "two billion, seven hundred fifty million, six hundred sixty-six thousand, twenty-one".