2721371691 has 16 divisors (see below), whose sum is σ = 3820611200. Its totient is φ = 1718247168.

The previous prime is 2721371689. The next prime is 2721371693. The reversal of 2721371691 is 1961731272.

It is an interprime number because it is at equal distance from previous prime (2721371689) and next prime (2721371693).

It is not a de Polignac number, because 2721371691 - 2¹ = 2721371689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2721371693) 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, 300315 + ... + 309243.

It is an arithmetic number, because the mean of its divisors is an integer number (238788200).

Almost surely, 2^2721371691 is an apocalyptic number.

2721371691 is a deficient number, since it is larger than the sum of its proper divisors (1099239509).

2721371691 is a wasteful number, since it uses less digits than its factorization.

2721371691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14298.

The product of its digits is 31752, while the sum is 39.

The square root of 2721371691 is about 52166.7680712539. The cubic root of 2721371691 is about 1396.1410209602.

The spelling of 2721371691 in words is "two billion, seven hundred twenty-one million, three hundred seventy-one thousand, six hundred ninety-one".