21222231230533 has 2 divisors, whose sum is σ = 21222231230534. Its totient is φ = 21222231230532.

The previous prime is 21222231230527. The next prime is 21222231230537. The reversal of 21222231230533 is 33503213222212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17093784298369 + 4128446932164 = 4134463^2 + 2031858^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222231230533 - 2¹³ = 21222231222341 is a prime.

It is a super-2 number, since 2×21222231230533² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222231230495 and 21222231230504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222231230537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611115615266 + 10611115615267.

It is an arithmetic number, because the mean of its divisors is an integer number (10611115615267).

Almost surely, 2^{21222231230533} is an apocalyptic number.

It is an amenable number.

21222231230533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222231230533 is an equidigital number, since it uses as much as digits as its factorization.

21222231230533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 21222231230533 its reverse (33503213222212), we get a palindrome (54725444452745).

The spelling of 21222231230533 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred thirty-one million, two hundred thirty thousand, five hundred thirty-three".