100100120021 has 4 divisors (see below), whose sum is σ = 109200130944. Its totient is φ = 91000109100.

The previous prime is 100100119991. The next prime is 100100120027. The reversal of 100100120021 is 120021001001.

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 100100120021 - 2²² = 100095925717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100100119990 and 100100120008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100120027) 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 3 ways as a sum of consecutive naturals, for example, 4550005445 + ... + 4550005466.

It is an arithmetic number, because the mean of its divisors is an integer number (27300032736).

Almost surely, 2^100100120021 is an apocalyptic number.

100100120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100100120021 is a deficient number, since it is larger than the sum of its proper divisors (9100010923).

100100120021 is an equidigital number, since it uses as much as digits as its factorization.

100100120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100010922.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100100120021 its reverse (120021001001), we get a palindrome (220121121022).

The spelling of 100100120021 in words is "one hundred billion, one hundred million, one hundred twenty thousand, twenty-one".