42213643 has 2 divisors, whose sum is σ = 42213644. Its totient is φ = 42213642.

The previous prime is 42213583. The next prime is 42213683. The reversal of 42213643 is 34631224.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42213643 is a prime.

It is not a weakly prime, because it can be changed into another prime (42213683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21106821 + 21106822.

It is an arithmetic number, because the mean of its divisors is an integer number (21106822).

Almost surely, 2^42213643 is an apocalyptic number.

42213643 is a deficient number, since it is larger than the sum of its proper divisors (1).

42213643 is an equidigital number, since it uses as much as digits as its factorization.

42213643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 42213643 is about 6497.2027057804. The cubic root of 42213643 is about 348.1910558544.

Adding to 42213643 its reverse (34631224), we get a palindrome (76844867).

The spelling of 42213643 in words is "forty-two million, two hundred thirteen thousand, six hundred forty-three".