42162821 has 8 divisors (see below), whose sum is σ = 43805184. Its totient is φ = 40538160.

The previous prime is 42162817. The next prime is 42162823. The reversal of 42162821 is 12826124.

It is a happy number.

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 42162821 - 2² = 42162817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42162823) 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, 536 + ... + 9198.

It is an arithmetic number, because the mean of its divisors is an integer number (5475648).

Almost surely, 2^42162821 is an apocalyptic number.

It is an amenable number.

42162821 is a deficient number, since it is larger than the sum of its proper divisors (1642363).

42162821 is a wasteful number, since it uses less digits than its factorization.

42162821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8851.

The product of its digits is 1536, while the sum is 26.

The square root of 42162821 is about 6493.2904601596. The cubic root of 42162821 is about 348.0512679345.

Adding to 42162821 its reverse (12826124), we get a palindrome (54988945).

The spelling of 42162821 in words is "forty-two million, one hundred sixty-two thousand, eight hundred twenty-one".