6542010121 has 4 divisors (see below), whose sum is σ = 6631626772. Its totient is φ = 6452393472.

The previous prime is 6542010113. The next prime is 6542010133. The reversal of 6542010121 is 1210102456.

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 4347556096 + 2194454025 = 65936^2 + 46845^2 .

It is a cyclic number.

It is not a de Polignac number, because 6542010121 - 2³ = 6542010113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6542010092 and 6542010101.

It is not an unprimeable number, because it can be changed into a prime (6542010151) 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 3 ways as a sum of consecutive naturals, for example, 44808216 + ... + 44808361.

It is an arithmetic number, because the mean of its divisors is an integer number (1657906693).

Almost surely, 2^6542010121 is an apocalyptic number.

It is an amenable number.

6542010121 is a deficient number, since it is larger than the sum of its proper divisors (89616651).

6542010121 is an equidigital number, since it uses as much as digits as its factorization.

6542010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89616650.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 6542010121 is about 80882.6935815073. The cubic root of 6542010121 is about 1870.2675435785.

Adding to 6542010121 its reverse (1210102456), we get a palindrome (7752112577).

The spelling of 6542010121 in words is "six billion, five hundred forty-two million, ten thousand, one hundred twenty-one".