242198921 has 2 divisors, whose sum is σ = 242198922. Its totient is φ = 242198920.

The previous prime is 242198917. The next prime is 242198927. The reversal of 242198921 is 129891242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131423296 + 110775625 = 11464^2 + 10525^2 .

It is a cyclic number.

It is not a de Polignac number, because 242198921 - 2² = 242198917 is a prime.

It is not a weakly prime, because it can be changed into another prime (242198927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121099460 + 121099461.

It is an arithmetic number, because the mean of its divisors is an integer number (121099461).

Almost surely, 2^242198921 is an apocalyptic number.

It is an amenable number.

242198921 is a deficient number, since it is larger than the sum of its proper divisors (1).

242198921 is an equidigital number, since it uses as much as digits as its factorization.

242198921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 242198921 is about 15562.7414358782. The cubic root of 242198921 is about 623.3386671231.

The spelling of 242198921 in words is "two hundred forty-two million, one hundred ninety-eight thousand, nine hundred twenty-one".