21122220999989 has 2 divisors, whose sum is σ = 21122220999990. Its totient is φ = 21122220999988.

The previous prime is 21122220999977. The next prime is 21122221000051. The reversal of 21122220999989 is 98999902222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21120780190225 + 1440809764 = 4595735^2 + 37958^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122220999989 - 2⁴ = 21122220999973 is a prime.

It is a super-2 number, since 2×21122220999989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122220999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561110499994 + 10561110499995.

It is an arithmetic number, because the mean of its divisors is an integer number (10561110499995).

Almost surely, 2^{21122220999989} is an apocalyptic number.

It is an amenable number.

21122220999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122220999989 is an equidigital number, since it uses as much as digits as its factorization.

21122220999989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15116544, while the sum is 65.

The spelling of 21122220999989 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred eighty-nine".