6721142401 has 4 divisors (see below), whose sum is σ = 6723115092. Its totient is φ = 6719169712.

The previous prime is 6721142381. The next prime is 6721142411. The reversal of 6721142401 is 1042411276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5151794176 + 1569348225 = 71776^2 + 39615^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721142401 - 2¹¹ = 6721140353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6721142401.

It is not an unprimeable number, because it can be changed into a prime (6721142411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981226 + ... + 988051.

It is an arithmetic number, because the mean of its divisors is an integer number (1680778773).

Almost surely, 2^6721142401 is an apocalyptic number.

It is an amenable number.

6721142401 is a deficient number, since it is larger than the sum of its proper divisors (1972691).

6721142401 is a wasteful number, since it uses less digits than its factorization.

6721142401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972690.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6721142401 is about 81982.5737641848. The cubic root of 6721142401 is about 1887.1845205581.

Adding to 6721142401 its reverse (1042411276), we get a palindrome (7763553677).

The spelling of 6721142401 in words is "six billion, seven hundred twenty-one million, one hundred forty-two thousand, four hundred one".