42083821 has 4 divisors (see below), whose sum is σ = 45321052. Its totient is φ = 38846592.

The previous prime is 42083819. The next prime is 42083831. The reversal of 42083821 is 12838024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6812100 + 35271721 = 2610^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 42083821 - 2¹ = 42083819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42083821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42083801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618596 + ... + 1618621.

It is an arithmetic number, because the mean of its divisors is an integer number (11330263).

Almost surely, 2^42083821 is an apocalyptic number.

It is an amenable number.

42083821 is a deficient number, since it is larger than the sum of its proper divisors (3237231).

42083821 is a wasteful number, since it uses less digits than its factorization.

42083821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237230.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 42083821 is about 6487.2044055972. The cubic root of 42083821 is about 347.8337521198.

The spelling of 42083821 in words is "forty-two million, eighty-three thousand, eight hundred twenty-one".