210020401 has 2 divisors, whose sum is σ = 210020402. Its totient is φ = 210020400.

The previous prime is 210020389. The next prime is 210020441. The reversal of 210020401 is 104020012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152275600 + 57744801 = 12340^2 + 7599^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020401 - 2¹⁵ = 209987633 is a prime.

It is not a weakly prime, because it can be changed into another prime (210020441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010200 + 105010201.

It is an arithmetic number, because the mean of its divisors is an integer number (105010201).

Almost surely, 2^210020401 is an apocalyptic number.

It is an amenable number.

210020401 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020401 is an equidigital number, since it uses as much as digits as its factorization.

210020401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 210020401 is about 14492.0806304685. The cubic root of 210020401 is about 594.4114425819.

Adding to 210020401 its reverse (104020012), we get a palindrome (314040413).

The spelling of 210020401 in words is "two hundred ten million, twenty thousand, four hundred one".