22000021000021 has 2 divisors, whose sum is σ = 22000021000022. Its totient is φ = 22000021000020.

The previous prime is 22000020999973. The next prime is 22000021000043. The reversal of 22000021000021 is 12000012000022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21174492480625 + 825528519396 = 4601575^2 + 908586^2 .

It is a cyclic number.

It is not a de Polignac number, because 22000021000021 - 2²⁹ = 21999484129109 is a prime.

22000021000021 is a modest number, since divided by 21000021 gives 22 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 22000020999971 and 22000021000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22000021000081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000010500010 + 11000010500011.

It is an arithmetic number, because the mean of its divisors is an integer number (11000010500011).

Almost surely, 2^{22000021000021} is an apocalyptic number.

It is an amenable number.

22000021000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22000021000021 is an equidigital number, since it uses as much as digits as its factorization.

22000021000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 22000021000021 its reverse (12000012000022), we get a palindrome (34000033000043).

It can be divided in two parts, 2200002 and 1000021, that added together give a palindrome (3200023).

The spelling of 22000021000021 in words is "twenty-two trillion, twenty-one million, twenty-one", and thus it is an aban number and an uban number.