42021401 has 2 divisors, whose sum is σ = 42021402. Its totient is φ = 42021400.

The previous prime is 42021389. The next prime is 42021509. The reversal of 42021401 is 10412024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 3519376 = 6205^2 + 1876^2 .

It is a cyclic number.

It is not a de Polignac number, because 42021401 - 2¹⁸ = 41759257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42021701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010700 + 21010701.

It is an arithmetic number, because the mean of its divisors is an integer number (21010701).

Almost surely, 2^42021401 is an apocalyptic number.

It is an amenable number.

42021401 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021401 is an equidigital number, since it uses as much as digits as its factorization.

42021401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 42021401 is about 6482.3916111263. The cubic root of 42021401 is about 347.6616945003.

Adding to 42021401 its reverse (10412024), we get a palindrome (52433425).

The spelling of 42021401 in words is "forty-two million, twenty-one thousand, four hundred one".