21220202329 has 2 divisors, whose sum is σ = 21220202330. Its totient is φ = 21220202328.

The previous prime is 21220202323. The next prime is 21220202359. The reversal of 21220202329 is 92320202212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19926145600 + 1294056729 = 141160^2 + 35973^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220202329 - 2¹⁹ = 21219678041 is a prime.

It is a super-3 number, since 3×21220202329³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21220202323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610101164 + 10610101165.

It is an arithmetic number, because the mean of its divisors is an integer number (10610101165).

Almost surely, 2^21220202329 is an apocalyptic number.

It is an amenable number.

21220202329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220202329 is an equidigital number, since it uses as much as digits as its factorization.

21220202329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 21220202329 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, three hundred twenty-nine".