100553512421 has 4 divisors (see below), whose sum is σ = 103797174144. Its totient is φ = 97309850700.

The previous prime is 100553512417. The next prime is 100553512429. The reversal of 100553512421 is 124215355001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100553512421 - 2² = 100553512417 is a prime.

It is a super-2 number, since 2×100553512421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100553512429) 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, 1621830815 + ... + 1621830876.

It is an arithmetic number, because the mean of its divisors is an integer number (25949293536).

Almost surely, 2^100553512421 is an apocalyptic number.

It is an amenable number.

100553512421 is a deficient number, since it is larger than the sum of its proper divisors (3243661723).

100553512421 is an equidigital number, since it uses as much as digits as its factorization.

100553512421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243661722.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 100553512421 its reverse (124215355001), we get a palindrome (224768867422).

The spelling of 100553512421 in words is "one hundred billion, five hundred fifty-three million, five hundred twelve thousand, four hundred twenty-one".