210421073 has 2 divisors, whose sum is σ = 210421074. Its totient is φ = 210421072.

The previous prime is 210421051. The next prime is 210421151. The reversal of 210421073 is 370124012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210163009 + 258064 = 14497^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 210421073 - 2¹² = 210416977 is a prime.

It is not a weakly prime, because it can be changed into another prime (210421573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105210536 + 105210537.

It is an arithmetic number, because the mean of its divisors is an integer number (105210537).

Almost surely, 2^210421073 is an apocalyptic number.

It is an amenable number.

210421073 is a deficient number, since it is larger than the sum of its proper divisors (1).

210421073 is an equidigital number, since it uses as much as digits as its factorization.

210421073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 210421073 is about 14505.8978694874. The cubic root of 210421073 is about 594.7892038631.

Adding to 210421073 its reverse (370124012), we get a palindrome (580545085).

The spelling of 210421073 in words is "two hundred ten million, four hundred twenty-one thousand, seventy-three".