100021111000021 has 2 divisors, whose sum is σ = 100021111000022. Its totient is φ = 100021111000020.

The previous prime is 100021111000009. The next prime is 100021111000037. The reversal of 100021111000021 is 120000111120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57967118140996 + 42053992859025 = 7613614^2 + 6484905^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021111000021 - 2²⁹ = 100020574129109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100021110999971 and 100021111000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100021111000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010555500010 + 50010555500011.

It is an arithmetic number, because the mean of its divisors is an integer number (50010555500011).

Almost surely, 2^{100021111000021} is an apocalyptic number.

It is an amenable number.

100021111000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021111000021 is an equidigital number, since it uses as much as digits as its factorization.

100021111000021 is an evil number, because the sum of its binary digits is even.

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

Adding to 100021111000021 its reverse (120000111120001), we get a palindrome (220021222120022).

The spelling of 100021111000021 in words is "one hundred trillion, twenty-one billion, one hundred eleven million, twenty-one", and thus it is an aban number.