2730211821 has 12 divisors (see below), whose sum is σ = 4151199520. Its totient is φ = 1724344200.

The previous prime is 2730211817. The next prime is 2730211879. The reversal of 2730211821 is 1281120372.

It is not a de Polignac number, because 2730211821 - 2² = 2730211817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2730211801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7982905 + ... + 7983246.

Almost surely, 2^2730211821 is an apocalyptic number.

It is an amenable number.

2730211821 is a deficient number, since it is larger than the sum of its proper divisors (1420987699).

2730211821 is a wasteful number, since it uses less digits than its factorization.

2730211821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15966176 (or 15966173 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 2730211821 is about 52251.4288895529. The cubic root of 2730211821 is about 1397.6511329623.

The spelling of 2730211821 in words is "two billion, seven hundred thirty million, two hundred eleven thousand, eight hundred twenty-one".