221212203229 has 2 divisors, whose sum is σ = 221212203230. Its totient is φ = 221212203228.

The previous prime is 221212203131. The next prime is 221212203353. The reversal of 221212203229 is 922302212122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175468832100 + 45743371129 = 418890^2 + 213877^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212203229 - 2¹⁷ = 221212072157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221212203197 and 221212203206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221212203829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606101614 + 110606101615.

It is an arithmetic number, because the mean of its divisors is an integer number (110606101615).

Almost surely, 2^221212203229 is an apocalyptic number.

It is an amenable number.

221212203229 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212203229 is an equidigital number, since it uses as much as digits as its factorization.

221212203229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 221212203229 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred three thousand, two hundred twenty-nine".