42210001221 has 8 divisors (see below), whose sum is σ = 56281715424. Its totient is φ = 28139143920.

The previous prime is 42210001217. The next prime is 42210001237. The reversal of 42210001221 is 12210001224.

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

It is not a de Polignac number, because 42210001221 - 2² = 42210001217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42210001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42210001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88795 + ... + 303816.

It is an arithmetic number, because the mean of its divisors is an integer number (7035214428).

Almost surely, 2^42210001221 is an apocalyptic number.

It is an amenable number.

42210001221 is a deficient number, since it is larger than the sum of its proper divisors (14071714203).

42210001221 is a wasteful number, since it uses less digits than its factorization.

42210001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428451.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 42210001221 its reverse (12210001224), we get a palindrome (54420002445).

The spelling of 42210001221 in words is "forty-two billion, two hundred ten million, one thousand, two hundred twenty-one".