556500100021 has 2 divisors, whose sum is σ = 556500100022. Its totient is φ = 556500100020.

The previous prime is 556500099941. The next prime is 556500100033. The reversal of 556500100021 is 120001005655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412214077521 + 144286022500 = 642039^2 + 379850^2 .

It is a cyclic number.

It is not a de Polignac number, because 556500100021 - 2²⁹ = 555963229109 is a prime.

It is a super-2 number, since 2×556500100021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556500100921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278250050010 + 278250050011.

It is an arithmetic number, because the mean of its divisors is an integer number (278250050011).

Almost surely, 2^556500100021 is an apocalyptic number.

It is an amenable number.

556500100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

556500100021 is an equidigital number, since it uses as much as digits as its factorization.

556500100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 556500100021 its reverse (120001005655), we get a palindrome (676501105676).

The spelling of 556500100021 in words is "five hundred fifty-six billion, five hundred million, one hundred thousand, twenty-one".