100021021021 has 2 divisors, whose sum is σ = 100021021022. Its totient is φ = 100021021020.

The previous prime is 100021021013. The next prime is 100021021063. The reversal of 100021021021 is 120120120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100021020121 + 900 = 316261^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021021021 - 2³ = 100021021013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100021020989 and 100021021007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100021021421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010510510 + 50010510511.

It is an arithmetic number, because the mean of its divisors is an integer number (50010510511).

Almost surely, 2^100021021021 is an apocalyptic number.

It is an amenable number.

100021021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021021021 is an equidigital number, since it uses as much as digits as its factorization.

100021021021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100021021021 its reverse (120120120001), we get a palindrome (220141141022).

The spelling of 100021021021 in words is "one hundred billion, twenty-one million, twenty-one thousand, twenty-one".