6750429921 has 63 divisors (see below), whose sum is σ = 10811788771. Its totient is φ = 4211901504.

The previous prime is 6750429913. The next prime is 6750429929. The reversal of 6750429921 is 1299240576.

The square root of 6750429921 is 82161.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (6750429913) and next prime (6750429929).

It can be written as a sum of positive squares in only one way, i.e., 5255525025 + 1494904896 = 72495^2 + 38664^2 .

It is not a de Polignac number, because 6750429921 - 2³ = 6750429913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6750429929) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 37711810 + ... + 37711988.

Almost surely, 2^6750429921 is an apocalyptic number.

6750429921 is the 82161-st square number.

6750429921 is the 41081-st centered octagonal number.

It is an amenable number.

6750429921 is a deficient number, since it is larger than the sum of its proper divisors (4061358850).

6750429921 is an frugal number, since it uses more digits than its factorization.

6750429921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The cubic root of 6750429921 is about 1889.9216974362.

The spelling of 6750429921 in words is "six billion, seven hundred fifty million, four hundred twenty-nine thousand, nine hundred twenty-one".