6144020721 has 16 divisors (see below), whose sum is σ = 9112324800. Its totient is φ = 4091481504.

The previous prime is 6144020719. The next prime is 6144020723. The reversal of 6144020721 is 1270204416.

6144020721 is a `hidden beast` number, since 614 + 4 + 0 + 20 + 7 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (6144020719) and next prime (6144020723).

It is not a de Polignac number, because 6144020721 - 2¹ = 6144020719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6144020723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100956 + ... + 149933.

It is an arithmetic number, because the mean of its divisors is an integer number (569520300).

Almost surely, 2^6144020721 is an apocalyptic number.

It is an amenable number.

6144020721 is a deficient number, since it is larger than the sum of its proper divisors (2968304079).

6144020721 is a wasteful number, since it uses less digits than its factorization.

6144020721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251805 (or 251799 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 6144020721 is about 78383.8039457132. The cubic root of 6144020721 is about 1831.5448470781.

The spelling of 6144020721 in words is "six billion, one hundred forty-four million, twenty thousand, seven hundred twenty-one".