42123401 has 2 divisors, whose sum is σ = 42123402. Its totient is φ = 42123400.

The previous prime is 42123379. The next prime is 42123449. The reversal of 42123401 is 10432124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41267776 + 855625 = 6424^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 42123401 - 2⁶ = 42123337 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 42123401.

It is not a weakly prime, because it can be changed into another prime (42123461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061700 + 21061701.

It is an arithmetic number, because the mean of its divisors is an integer number (21061701).

Almost surely, 2^42123401 is an apocalyptic number.

It is an amenable number.

42123401 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123401 is an equidigital number, since it uses as much as digits as its factorization.

42123401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 42123401 is about 6490.2543093472. The cubic root of 42123401 is about 347.9427642911.

Adding to 42123401 its reverse (10432124), we get a palindrome (52555525).

It can be divided in two parts, 42123 and 401, that added together give a palindrome (42524).

The spelling of 42123401 in words is "forty-two million, one hundred twenty-three thousand, four hundred one".