222121209949 has 2 divisors, whose sum is σ = 222121209950. Its totient is φ = 222121209948.

The previous prime is 222121209911. The next prime is 222121210009. The reversal of 222121209949 is 949902121222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188225822500 + 33895387449 = 433850^2 + 184107^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121209949 - 2²⁹ = 221584339037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121209049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060604974 + 111060604975.

It is an arithmetic number, because the mean of its divisors is an integer number (111060604975).

Almost surely, 2^222121209949 is an apocalyptic number.

It is an amenable number.

222121209949 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121209949 is an equidigital number, since it uses as much as digits as its factorization.

222121209949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 222121209949 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred nine thousand, nine hundred forty-nine".