210140221 has 2 divisors, whose sum is σ = 210140222. Its totient is φ = 210140220.

The previous prime is 210140201. The next prime is 210140311. The reversal of 210140221 is 122041012.

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., 178623225 + 31516996 = 13365^2 + 5614^2 .

It is a cyclic number.

It is not a de Polignac number, because 210140221 - 2¹³ = 210132029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210140201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105070110 + 105070111.

It is an arithmetic number, because the mean of its divisors is an integer number (105070111).

Almost surely, 2^210140221 is an apocalyptic number.

It is an amenable number.

210140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210140221 is an equidigital number, since it uses as much as digits as its factorization.

210140221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 210140221 is about 14496.2140229786. The cubic root of 210140221 is about 594.5244615053.

Adding to 210140221 its reverse (122041012), we get a palindrome (332181233).

The spelling of 210140221 in words is "two hundred ten million, one hundred forty thousand, two hundred twenty-one".