6542100421 has 8 divisors (see below), whose sum is σ = 6745848480. Its totient is φ = 6341326992.

The previous prime is 6542100391. The next prime is 6542100443. The reversal of 6542100421 is 1240012456.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6542100421 - 2¹³ = 6542092229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542100491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739191 + ... + 747988.

It is an arithmetic number, because the mean of its divisors is an integer number (843231060).

Almost surely, 2^6542100421 is an apocalyptic number.

It is an amenable number.

6542100421 is a deficient number, since it is larger than the sum of its proper divisors (203748059).

6542100421 is a wasteful number, since it uses less digits than its factorization.

6542100421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487315.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 6542100421 is about 80883.2517954119. The cubic root of 6542100421 is about 1870.2761487004.

Adding to 6542100421 its reverse (1240012456), we get a palindrome (7782112877).

The spelling of 6542100421 in words is "six billion, five hundred forty-two million, one hundred thousand, four hundred twenty-one".