21022211019989 has 2 divisors, whose sum is σ = 21022211019990. Its totient is φ = 21022211019988.

The previous prime is 21022211019977. The next prime is 21022211020049. The reversal of 21022211019989 is 98991011222012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20132899780900 + 889311239089 = 4486970^2 + 943033^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022211019989 - 2³⁶ = 20953491543253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022211019959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511105509994 + 10511105509995.

It is an arithmetic number, because the mean of its divisors is an integer number (10511105509995).

Almost surely, 2^{21022211019989} is an apocalyptic number.

It is an amenable number.

21022211019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022211019989 is an equidigital number, since it uses as much as digits as its factorization.

21022211019989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 47.

The spelling of 21022211019989 in words is "twenty-one trillion, twenty-two billion, two hundred eleven million, nineteen thousand, nine hundred eighty-nine".