100111201021 has 4 divisors (see below), whose sum is σ = 107812062652. Its totient is φ = 92410339392.

The previous prime is 100111201019. The next prime is 100111201033. The reversal of 100111201021 is 120102111001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120102111001 = 1163 ⋅103269227.

It can be written as a sum of positive squares in 2 ways, for example, as 45565598521 + 54545602500 = 213461^2 + 233550^2 .

It is a cyclic number.

It is not a de Polignac number, because 100111201021 - 2¹ = 100111201019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100111200989 and 100111201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100111201061) 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, 3850430796 + ... + 3850430821.

It is an arithmetic number, because the mean of its divisors is an integer number (26953015663).

Almost surely, 2^100111201021 is an apocalyptic number.

It is an amenable number.

100111201021 is a deficient number, since it is larger than the sum of its proper divisors (7700861631).

100111201021 is an equidigital number, since it uses as much as digits as its factorization.

100111201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700861630.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 100111201021 its reverse (120102111001), we get a palindrome (220213312022).

The spelling of 100111201021 in words is "one hundred billion, one hundred eleven million, two hundred one thousand, twenty-one".