555102421 has 2 divisors, whose sum is σ = 555102422. Its totient is φ = 555102420.

The previous prime is 555102409. The next prime is 555102467. The reversal of 555102421 is 124201555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515789521 + 39312900 = 22711^2 + 6270^2 .

It is a cyclic number.

It is not a de Polignac number, because 555102421 - 2¹³ = 555094229 is a prime.

It is a super-2 number, since 2×555102421² = 616277395600122482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555102521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277551210 + 277551211.

It is an arithmetic number, because the mean of its divisors is an integer number (277551211).

Almost surely, 2^555102421 is an apocalyptic number.

It is an amenable number.

555102421 is a deficient number, since it is larger than the sum of its proper divisors (1).

555102421 is an equidigital number, since it uses as much as digits as its factorization.

555102421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 555102421 is about 23560.6116431641. The cubic root of 555102421 is about 821.8471254667.

Adding to 555102421 its reverse (124201555), we get a palindrome (679303976).

The spelling of 555102421 in words is "five hundred fifty-five million, one hundred two thousand, four hundred twenty-one".