21201222089 has 2 divisors, whose sum is σ = 21201222090. Its totient is φ = 21201222088.

The previous prime is 21201222079. The next prime is 21201222101. The reversal of 21201222089 is 98022210212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13473405625 + 7727816464 = 116075^2 + 87908^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201222089 - 2¹⁶ = 21201156553 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201222079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600611044 + 10600611045.

It is an arithmetic number, because the mean of its divisors is an integer number (10600611045).

Almost surely, 2^21201222089 is an apocalyptic number.

It is an amenable number.

21201222089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201222089 is an equidigital number, since it uses as much as digits as its factorization.

21201222089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21201222089 in words is "twenty-one billion, two hundred one million, two hundred twenty-two thousand, eighty-nine".