2742791721 has 12 divisors (see below), whose sum is σ = 3859664112. Its totient is φ = 1732288824.

The previous prime is 2742791693. The next prime is 2742791767. The reversal of 2742791721 is 1271972472.

It is not a de Polignac number, because 2742791721 - 2⁶ = 2742791657 is a prime.

It is a super-2 number, since 2×2742791721² = 15045812849572283682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2742791021) 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, 1265211 + ... + 1267376.

It is an arithmetic number, because the mean of its divisors is an integer number (321638676).

Almost surely, 2^2742791721 is an apocalyptic number.

It is an amenable number.

2742791721 is a deficient number, since it is larger than the sum of its proper divisors (1116872391).

2742791721 is a wasteful number, since it uses less digits than its factorization.

2742791721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532628 (or 2532609 counting only the distinct ones).

The product of its digits is 98784, while the sum is 42.

The square root of 2742791721 is about 52371.6690683045. The cubic root of 2742791721 is about 1399.7944802054.

The spelling of 2742791721 in words is "two billion, seven hundred forty-two million, seven hundred ninety-one thousand, seven hundred twenty-one".