210020137 has 2 divisors, whose sum is σ = 210020138. Its totient is φ = 210020136.

The previous prime is 210020101. The next prime is 210020189. The reversal of 210020137 is 731020012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162078361 + 47941776 = 12731^2 + 6924^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020137 - 2¹¹ = 210018089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210020137.

It is not a weakly prime, because it can be changed into another prime (210026137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010068 + 105010069.

It is an arithmetic number, because the mean of its divisors is an integer number (105010069).

Almost surely, 2^210020137 is an apocalyptic number.

It is an amenable number.

210020137 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020137 is an equidigital number, since it uses as much as digits as its factorization.

210020137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 210020137 is about 14492.0715220427. The cubic root of 210020137 is about 594.4111935193.

Adding to 210020137 its reverse (731020012), we get a palindrome (941040149).

The spelling of 210020137 in words is "two hundred ten million, twenty thousand, one hundred thirty-seven".