427130821 has 16 divisors (see below), whose sum is σ = 477509760. Its totient is φ = 379350720.

The previous prime is 427130813. The next prime is 427130827. The reversal of 427130821 is 128031724.

It is a cyclic number.

It is not a de Polignac number, because 427130821 - 2³ = 427130813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 427130821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427130827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115426 + ... + 119068.

It is an arithmetic number, because the mean of its divisors is an integer number (29844360).

Almost surely, 2^427130821 is an apocalyptic number.

It is an amenable number.

427130821 is a deficient number, since it is larger than the sum of its proper divisors (50378939).

427130821 is a wasteful number, since it uses less digits than its factorization.

427130821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 427130821 is about 20667.1435133160. The cubic root of 427130821 is about 753.1017153915.

The spelling of 427130821 in words is "four hundred twenty-seven million, one hundred thirty thousand, eight hundred twenty-one".