21222223355539 has 2 divisors, whose sum is σ = 21222223355540. Its totient is φ = 21222223355538.

The previous prime is 21222223355413. The next prime is 21222223355587. The reversal of 21222223355539 is 93555332222212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222223355539 - 2¹¹ = 21222223353491 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222223356539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611111677769 + 10611111677770.

It is an arithmetic number, because the mean of its divisors is an integer number (10611111677770).

Almost surely, 2^{21222223355539} is an apocalyptic number.

21222223355539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222223355539 is an equidigital number, since it uses as much as digits as its factorization.

21222223355539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 46.

The spelling of 21222223355539 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-three million, three hundred fifty-five thousand, five hundred thirty-nine".