100100001101021 has 4 divisors (see below), whose sum is σ = 101988680367132. Its totient is φ = 98211321834912.

The previous prime is 100100001100997. The next prime is 100100001101083. The reversal of 100100001101021 is 120101100001001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41892104152921 + 58207896948100 = 6472411^2 + 7629410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100100001101021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100001101621) 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, 944339632976 + ... + 944339633081.

It is an arithmetic number, because the mean of its divisors is an integer number (25497170091783).

Almost surely, 2^{100100001101021} is an apocalyptic number.

It is an amenable number.

100100001101021 is a deficient number, since it is larger than the sum of its proper divisors (1888679266111).

100100001101021 is an equidigital number, since it uses as much as digits as its factorization.

100100001101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888679266110.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 100100001101021 its reverse (120101100001001), we get a palindrome (220201101102022).

The spelling of 100100001101021 in words is "one hundred trillion, one hundred billion, one million, one hundred one thousand, twenty-one".