100100000101021 has 4 divisors (see below), whose sum is σ = 100262236730652. Its totient is φ = 99937763471392.

The previous prime is 100100000101007. The next prime is 100100000101039. The reversal of 100100000101021 is 120101000001001.

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 1932130580121 + 98167869520900 = 1390011^2 + 9907970^2 .

It is a cyclic number.

It is not a de Polignac number, because 100100000101021 - 2⁴⁵ = 64915628012189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100100000100995 and 100100000101013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100000101091) 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, 81118313890 + ... + 81118315123.

It is an arithmetic number, because the mean of its divisors is an integer number (25065559182663).

Almost surely, 2^{100100000101021} is an apocalyptic number.

It is an amenable number.

100100000101021 is a deficient number, since it is larger than the sum of its proper divisors (162236629631).

100100000101021 is an equidigital number, since it uses as much as digits as its factorization.

100100000101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162236629630.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 100100000101021 its reverse (120101000001001), we get a palindrome (220201000102022).

The spelling of 100100000101021 in words is "one hundred trillion, one hundred billion, one hundred one thousand, twenty-one".