42242121 has 16 divisors (see below), whose sum is σ = 62689920. Its totient is φ = 28112400.

The previous prime is 42242087. The next prime is 42242141. The reversal of 42242121 is 12124224.

It is not a de Polignac number, because 42242121 - 2²² = 38047817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42242094 and 42242103.

It is not an unprimeable number, because it can be changed into a prime (42242141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21271 + ... + 23171.

It is an arithmetic number, because the mean of its divisors is an integer number (3918120).

It is a self-describing number.

Almost surely, 2^42242121 is an apocalyptic number.

It is an amenable number.

42242121 is a deficient number, since it is larger than the sum of its proper divisors (20447799).

42242121 is a wasteful number, since it uses less digits than its factorization.

42242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733 (or 2727 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 42242121 is about 6499.3938948182. The cubic root of 42242121 is about 348.2693366758.

Adding to 42242121 its reverse (12124224), we get a palindrome (54366345).

The spelling of 42242121 in words is "forty-two million, two hundred forty-two thousand, one hundred twenty-one".