242899210921 has 2 divisors, whose sum is σ = 242899210922. Its totient is φ = 242899210920.

The previous prime is 242899210903. The next prime is 242899210949. The reversal of 242899210921 is 129012998242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239939306896 + 2959904025 = 489836^2 + 54405^2 .

It is a cyclic number.

It is not a de Polignac number, because 242899210921 - 2⁷ = 242899210793 is a prime.

It is not a weakly prime, because it can be changed into another prime (242899210901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121449605460 + 121449605461.

It is an arithmetic number, because the mean of its divisors is an integer number (121449605461).

Almost surely, 2^242899210921 is an apocalyptic number.

It is an amenable number.

242899210921 is a deficient number, since it is larger than the sum of its proper divisors (1).

242899210921 is an equidigital number, since it uses as much as digits as its factorization.

242899210921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 242899210921 in words is "two hundred forty-two billion, eight hundred ninety-nine million, two hundred ten thousand, nine hundred twenty-one".