2731066021 has 4 divisors (see below), whose sum is σ = 2731277632. Its totient is φ = 2730854412.

The previous prime is 2731065979. The next prime is 2731066033. The reversal of 2731066021 is 1206601372.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2731066021 - 2⁹ = 2731065509 is a prime.

It is a super-2 number, since 2×2731066021² = 14917443222121544882, 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 (2731066081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85095 + ... + 112708.

It is an arithmetic number, because the mean of its divisors is an integer number (682819408).

Almost surely, 2^2731066021 is an apocalyptic number.

It is an amenable number.

2731066021 is a deficient number, since it is larger than the sum of its proper divisors (211611).

2731066021 is a wasteful number, since it uses less digits than its factorization.

2731066021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211610.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 2731066021 is about 52259.6021894541. The cubic root of 2731066021 is about 1397.7968785660.

Adding to 2731066021 its reverse (1206601372), we get a palindrome (3937667393).

The spelling of 2731066021 in words is "two billion, seven hundred thirty-one million, sixty-six thousand, twenty-one".