242121401 has 2 divisors, whose sum is σ = 242121402. Its totient is φ = 242121400.

The previous prime is 242121353. The next prime is 242121413. The reversal of 242121401 is 104121242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187005625 + 55115776 = 13675^2 + 7424^2 .

It is a cyclic number.

It is not a de Polignac number, because 242121401 - 2²² = 237927097 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242121401.

It is not a weakly prime, because it can be changed into another prime (242121421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121060700 + 121060701.

It is an arithmetic number, because the mean of its divisors is an integer number (121060701).

Almost surely, 2^242121401 is an apocalyptic number.

It is an amenable number.

242121401 is a deficient number, since it is larger than the sum of its proper divisors (1).

242121401 is an equidigital number, since it uses as much as digits as its factorization.

242121401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 242121401 is about 15560.2506727880. The cubic root of 242121401 is about 623.2721565463.

Adding to 242121401 its reverse (104121242), we get a palindrome (346242643).

The spelling of 242121401 in words is "two hundred forty-two million, one hundred twenty-one thousand, four hundred one".