210131027221 has 2 divisors, whose sum is σ = 210131027222. Its totient is φ = 210131027220.

The previous prime is 210131027179. The next prime is 210131027437. The reversal of 210131027221 is 122720131012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206529347025 + 3601680196 = 454455^2 + 60014^2 .

It is a cyclic number.

It is not a de Polignac number, because 210131027221 - 2¹¹ = 210131025173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210131027192 and 210131027201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210131027021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105065513610 + 105065513611.

It is an arithmetic number, because the mean of its divisors is an integer number (105065513611).

Almost surely, 2^210131027221 is an apocalyptic number.

It is an amenable number.

210131027221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210131027221 is an equidigital number, since it uses as much as digits as its factorization.

210131027221 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 22.

Adding to 210131027221 its reverse (122720131012), we get a palindrome (332851158233).

The spelling of 210131027221 in words is "two hundred ten billion, one hundred thirty-one million, twenty-seven thousand, two hundred twenty-one".