42220121 has 8 divisors (see below), whose sum is σ = 42977088. Its totient is φ = 41470000.

The previous prime is 42220103. The next prime is 42220127. The reversal of 42220121 is 12102224.

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 42220121 - 2¹⁴ = 42203737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42220096 and 42220105.

It is not an unprimeable number, because it can be changed into a prime (42220127) 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, 11636 + ... + 14826.

It is an arithmetic number, because the mean of its divisors is an integer number (5372136).

Almost surely, 2^42220121 is an apocalyptic number.

It is an amenable number.

42220121 is a deficient number, since it is larger than the sum of its proper divisors (756967).

42220121 is a wasteful number, since it uses less digits than its factorization.

42220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 42220121 is about 6497.7012088892. The cubic root of 42220121 is about 348.2088657861.

Adding to 42220121 its reverse (12102224), we get a palindrome (54322345).

The spelling of 42220121 in words is "forty-two million, two hundred twenty thousand, one hundred twenty-one".