42212251 has 4 divisors (see below), whose sum is σ = 43110432. Its totient is φ = 41314072.

The previous prime is 42212237. The next prime is 42212267. The reversal of 42212251 is 15221224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42212251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42212351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449020 + ... + 449113.

It is an arithmetic number, because the mean of its divisors is an integer number (10777608).

Almost surely, 2^42212251 is an apocalyptic number.

42212251 is a deficient number, since it is larger than the sum of its proper divisors (898181).

42212251 is an equidigital number, since it uses as much as digits as its factorization.

42212251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898180.

The product of its digits is 320, while the sum is 19.

The square root of 42212251 is about 6497.0955818735. The cubic root of 42212251 is about 348.1872285983.

Adding to 42212251 its reverse (15221224), we get a palindrome (57433475).

The spelling of 42212251 in words is "forty-two million, two hundred twelve thousand, two hundred fifty-one".