42220551 has 8 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 27989432.

The previous prime is 42220517. The next prime is 42220559. The reversal of 42220551 is 15502224.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42220551 - 2²¹ = 40123399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42220559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38775 + ... + 39848.

It is an arithmetic number, because the mean of its divisors is an integer number (7076160).

Almost surely, 2^42220551 is an apocalyptic number.

42220551 is a deficient number, since it is larger than the sum of its proper divisors (14388729).

42220551 is a wasteful number, since it uses less digits than its factorization.

42220551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78805.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 42220551 is about 6497.7342974301. The cubic root of 42220551 is about 348.2100479184.

Adding to 42220551 its reverse (15502224), we get a palindrome (57722775).

The spelling of 42220551 in words is "forty-two million, two hundred twenty thousand, five hundred fifty-one".