100001120021 has 4 divisors (see below), whose sum is σ = 109092130944. Its totient is φ = 90910109100.

The previous prime is 100001119973. The next prime is 100001120027. The reversal of 100001120021 is 120021100001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120021100001 = 11 ⋅10911009091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100001120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001119990 and 100001120008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001120027) 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, 4545505445 + ... + 4545505466.

It is an arithmetic number, because the mean of its divisors is an integer number (27273032736).

Almost surely, 2^100001120021 is an apocalyptic number.

100001120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100001120021 is a deficient number, since it is larger than the sum of its proper divisors (9091010923).

100001120021 is an equidigital number, since it uses as much as digits as its factorization.

100001120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091010922.

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

Adding to 100001120021 its reverse (120021100001), we get a palindrome (220022220022).

It can be divided in two parts, 100001 and 120021, that multiplied together give a palindrome (12002220021).

The spelling of 100001120021 in words is "one hundred billion, one million, one hundred twenty thousand, twenty-one".