2721921811 has 16 divisors (see below), whose sum is σ = 3136573440. Its totient is φ = 2313787680.

The previous prime is 2721921781. The next prime is 2721921823. The reversal of 2721921811 is 1181291272.

2721921811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2721921811 - 2⁹ = 2721921299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2721921911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557521 + ... + 562381.

It is an arithmetic number, because the mean of its divisors is an integer number (196035840).

Almost surely, 2^2721921811 is an apocalyptic number.

2721921811 is a deficient number, since it is larger than the sum of its proper divisors (414651629).

2721921811 is a wasteful number, since it uses less digits than its factorization.

2721921811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5514.

The product of its digits is 4032, while the sum is 34.

The square root of 2721921811 is about 52172.0405102196. The cubic root of 2721921811 is about 1396.2350903535.

The spelling of 2721921811 in words is "two billion, seven hundred twenty-one million, nine hundred twenty-one thousand, eight hundred eleven".