556007021 has 4 divisors (see below), whose sum is σ = 556213344. Its totient is φ = 555800700.

The previous prime is 556006999. The next prime is 556007107. The reversal of 556007021 is 120700655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 556007021 - 2¹⁸ = 555744877 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 (556007521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99065 + ... + 104526.

It is an arithmetic number, because the mean of its divisors is an integer number (139053336).

Almost surely, 2^556007021 is an apocalyptic number.

It is an amenable number.

556007021 is a deficient number, since it is larger than the sum of its proper divisors (206323).

556007021 is a wasteful number, since it uses less digits than its factorization.

556007021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206322.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 556007021 is about 23579.8011229951. The cubic root of 556007021 is about 822.2933130568.

Adding to 556007021 its reverse (120700655), we get a palindrome (676707676).

The spelling of 556007021 in words is "five hundred fifty-six million, seven thousand, twenty-one".