42221997 has 12 divisors (see below), whose sum is σ = 63639264. Its totient is φ = 26924040.

The previous prime is 42221989. The next prime is 42222023. The reversal of 42221997 is 79912224.

It is not a de Polignac number, because 42221997 - 2³ = 42221989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42221917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101779 + ... + 102192.

It is an arithmetic number, because the mean of its divisors is an integer number (5303272).

Almost surely, 2^42221997 is an apocalyptic number.

It is an amenable number.

42221997 is a deficient number, since it is larger than the sum of its proper divisors (21417267).

42221997 is a wasteful number, since it uses less digits than its factorization.

42221997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204000 (or 203997 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 42221997 is about 6497.8455660319. The cubic root of 42221997 is about 348.2140231229.

The spelling of 42221997 in words is "forty-two million, two hundred twenty-one thousand, nine hundred ninety-seven".