556106421 has 24 divisors (see below), whose sum is σ = 842772000. Its totient is φ = 324199584.

The previous prime is 556106417. The next prime is 556106429. The reversal of 556106421 is 124601655.

It is not a de Polignac number, because 556106421 - 2² = 556106417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556106429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5671 + ... + 33828.

It is an arithmetic number, because the mean of its divisors is an integer number (35115500).

Almost surely, 2^556106421 is an apocalyptic number.

It is an amenable number.

556106421 is a deficient number, since it is larger than the sum of its proper divisors (286665579).

556106421 is a wasteful number, since it uses less digits than its factorization.

556106421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39553 (or 39534 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 556106421 is about 23581.9087649834. The cubic root of 556106421 is about 822.3423118896.

The spelling of 556106421 in words is "five hundred fifty-six million, one hundred six thousand, four hundred twenty-one".