21200222120989 has 2 divisors, whose sum is σ = 21200222120990. Its totient is φ = 21200222120988.

The previous prime is 21200222120981. The next prime is 21200222121131. The reversal of 21200222120989 is 98902122200212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19312140015364 + 1888082105625 = 4394558^2 + 1374075^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200222120989 - 2³ = 21200222120981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200222120981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600111060494 + 10600111060495.

It is an arithmetic number, because the mean of its divisors is an integer number (10600111060495).

Almost surely, 2^{21200222120989} is an apocalyptic number.

It is an amenable number.

21200222120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200222120989 is an equidigital number, since it uses as much as digits as its factorization.

21200222120989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 21200222120989 in words is "twenty-one trillion, two hundred billion, two hundred twenty-two million, one hundred twenty thousand, nine hundred eighty-nine".