42280821 has 12 divisors (see below), whose sum is σ = 66624480. Its totient is φ = 25624680.

The previous prime is 42280817. The next prime is 42280873. The reversal of 42280821 is 12808224.

42280821 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 42280821 - 2² = 42280817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42280891) 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 11 ways as a sum of consecutive naturals, for example, 213441 + ... + 213638.

It is an arithmetic number, because the mean of its divisors is an integer number (5552040).

Almost surely, 2^42280821 is an apocalyptic number.

It is an amenable number.

42280821 is a deficient number, since it is larger than the sum of its proper divisors (24343659).

42280821 is a wasteful number, since it uses less digits than its factorization.

42280821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427096 (or 427093 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 42280821 is about 6502.3704139337. The cubic root of 42280821 is about 348.3756595367.

The spelling of 42280821 in words is "forty-two million, two hundred eighty thousand, eight hundred twenty-one".