242621123 has 2 divisors, whose sum is σ = 242621124. Its totient is φ = 242621122.

The previous prime is 242621083. The next prime is 242621147. The reversal of 242621123 is 321126242.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242621123 - 2¹⁶ = 242555587 is a prime.

It is a super-2 number, since 2×242621123² = 117730018651562258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (242621023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121310561 + 121310562.

It is an arithmetic number, because the mean of its divisors is an integer number (121310562).

Almost surely, 2^242621123 is an apocalyptic number.

242621123 is a deficient number, since it is larger than the sum of its proper divisors (1).

242621123 is an equidigital number, since it uses as much as digits as its factorization.

242621123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 242621123 is about 15576.3000420511. The cubic root of 242621123 is about 623.7006589056.

Adding to 242621123 its reverse (321126242), we get a palindrome (563747365).

The spelling of 242621123 in words is "two hundred forty-two million, six hundred twenty-one thousand, one hundred twenty-three".