42216621 has 8 divisors (see below), whose sum is σ = 56600544. Its totient is φ = 27988560.

The previous prime is 42216607. The next prime is 42216649. The reversal of 42216621 is 12661224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42216621 - 2⁵ = 42216589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42216591 and 42216600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42216521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38331 + ... + 39416.

It is an arithmetic number, because the mean of its divisors is an integer number (7075068).

Almost surely, 2^42216621 is an apocalyptic number.

It is an amenable number.

42216621 is a deficient number, since it is larger than the sum of its proper divisors (14383923).

42216621 is a wasteful number, since it uses less digits than its factorization.

42216621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77931.

The product of its digits is 1152, while the sum is 24.

The square root of 42216621 is about 6497.4318772881. The cubic root of 42216621 is about 348.1992434806.

Adding to 42216621 its reverse (12661224), we get a palindrome (54877845).

The spelling of 42216621 in words is "forty-two million, two hundred sixteen thousand, six hundred twenty-one".