42222021 has 4 divisors (see below), whose sum is σ = 56296032. Its totient is φ = 28148012.

The previous prime is 42221989. The next prime is 42222023. The reversal of 42222021 is 12022224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42222021 - 2⁵ = 42221989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42222023) 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, 7037001 + ... + 7037006.

It is an arithmetic number, because the mean of its divisors is an integer number (14074008).

Almost surely, 2^42222021 is an apocalyptic number.

It is an amenable number.

42222021 is a deficient number, since it is larger than the sum of its proper divisors (14074011).

42222021 is a wasteful number, since it uses less digits than its factorization.

42222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14074010.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 42222021 is about 6497.8474127976. The cubic root of 42222021 is about 348.2140891007.

Adding to 42222021 its reverse (12022224), we get a palindrome (54244245).

The spelling of 42222021 in words is "forty-two million, two hundred twenty-two thousand, twenty-one".