621542135254101 has 8 divisors (see below), whose sum is σ = 828738986865504. Its totient is φ = 414353353572720.

The previous prime is 621542135254063. The next prime is 621542135254111. The reversal of 621542135254101 is 101452531245126.

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

It is not a de Polignac number, because 621542135254101 - 2⁷ = 621542135253973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621542135254111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2017302790 + ... + 2017610871.

It is an arithmetic number, because the mean of its divisors is an integer number (103592373358188).

Almost surely, 2^{621542135254101} is an apocalyptic number.

It is an amenable number.

621542135254101 is a deficient number, since it is larger than the sum of its proper divisors (207196851611403).

621542135254101 is a wasteful number, since it uses less digits than its factorization.

621542135254101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034965011.

The product of its (nonzero) digits is 288000, while the sum is 42.

Adding to 621542135254101 its reverse (101452531245126), we get a palindrome (722994666499227).

The spelling of 621542135254101 in words is "six hundred twenty-one trillion, five hundred forty-two billion, one hundred thirty-five million, two hundred fifty-four thousand, one hundred one".