100811021 has 2 divisors, whose sum is σ = 100811022. Its totient is φ = 100811020.

The previous prime is 100810993. The next prime is 100811057. The reversal of 100811021 is 120118001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58690921 + 42120100 = 7661^2 + 6490^2 .

It is a cyclic number.

It is not a de Polignac number, because 100811021 - 2²² = 96616717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100810987 and 100811005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100811621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50405510 + 50405511.

It is an arithmetic number, because the mean of its divisors is an integer number (50405511).

Almost surely, 2^100811021 is an apocalyptic number.

It is an amenable number.

100811021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100811021 is an equidigital number, since it uses as much as digits as its factorization.

100811021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 100811021 is about 10040.4691623450. The cubic root of 100811021 is about 465.4103149820.

Adding to 100811021 its reverse (120118001), we get a palindrome (220929022).

The spelling of 100811021 in words is "one hundred million, eight hundred eleven thousand, twenty-one".