42821801 has 16 divisors (see below), whose sum is σ = 49401600. Its totient is φ = 36709200.

The previous prime is 42821797. The next prime is 42821803. The reversal of 42821801 is 10812824.

It is not a de Polignac number, because 42821801 - 2² = 42821797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42821803) 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, 68870 + ... + 69488.

It is an arithmetic number, because the mean of its divisors is an integer number (3087600).

Almost surely, 2^42821801 is an apocalyptic number.

It is an amenable number.

42821801 is a deficient number, since it is larger than the sum of its proper divisors (6579799).

42821801 is a wasteful number, since it uses less digits than its factorization.

42821801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 42821801 is about 6543.8368714387. The cubic root of 42821801 is about 349.8551809030.

The spelling of 42821801 in words is "forty-two million, eight hundred twenty-one thousand, eight hundred one".