110021000021 has 2 divisors, whose sum is σ = 110021000022. Its totient is φ = 110021000020.

The previous prime is 110020999969. The next prime is 110021000059. The reversal of 110021000021 is 120000120011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78607336900 + 31413663121 = 280370^2 + 177239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-110021000021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 110020999972 and 110021000008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110021090021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55010500010 + 55010500011.

It is an arithmetic number, because the mean of its divisors is an integer number (55010500011).

Almost surely, 2^110021000021 is an apocalyptic number.

It is an amenable number.

110021000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

110021000021 is an equidigital number, since it uses as much as digits as its factorization.

110021000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 110021000021 its reverse (120000120011), we get a palindrome (230021120032).

The spelling of 110021000021 in words is "one hundred ten billion, twenty-one million, twenty-one", and thus it is an aban number.