42637221 has 24 divisors (see below), whose sum is σ = 69507360. Its totient is φ = 24948000.

The previous prime is 42637211. The next prime is 42637229. The reversal of 42637221 is 12273624.

42637221 is a `hidden beast` number, since 4 + 2 + 637 + 2 + 21 = 666.

42637221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42637221 - 2⁶ = 42637157 is a prime.

It is a super-2 number, since 2×42637221² = 3635865229205682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42637229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4555 + ... + 10296.

It is an arithmetic number, because the mean of its divisors is an integer number (2896140).

Almost surely, 2^42637221 is an apocalyptic number.

It is an amenable number.

42637221 is a deficient number, since it is larger than the sum of its proper divisors (26870139).

42637221 is a wasteful number, since it uses less digits than its factorization.

42637221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14897 (or 14894 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 42637221 is about 6529.7182940767. The cubic root of 42637221 is about 349.3517825229.

The spelling of 42637221 in words is "forty-two million, six hundred thirty-seven thousand, two hundred twenty-one".