210552421 has 2 divisors, whose sum is σ = 210552422. Its totient is φ = 210552420.

The previous prime is 210552389. The next prime is 210552427. The reversal of 210552421 is 124255012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210540100 + 12321 = 14510^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 210552421 - 2⁵ = 210552389 is a prime.

It is a super-2 number, since 2×210552421² = 88664643977922482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210552392 and 210552401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210552427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105276210 + 105276211.

It is an arithmetic number, because the mean of its divisors is an integer number (105276211).

Almost surely, 2^210552421 is an apocalyptic number.

It is an amenable number.

210552421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210552421 is an equidigital number, since it uses as much as digits as its factorization.

210552421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 210552421 is about 14510.4245630512. The cubic root of 210552421 is about 594.9129369116.

The spelling of 210552421 in words is "two hundred ten million, five hundred fifty-two thousand, four hundred twenty-one".