21132210257 has 2 divisors, whose sum is σ = 21132210258. Its totient is φ = 21132210256.

The previous prime is 21132210223. The next prime is 21132210271. The reversal of 21132210257 is 75201223112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10589233216 + 10542977041 = 102904^2 + 102679^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132210257 - 2⁶ = 21132210193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21132210287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566105128 + 10566105129.

It is an arithmetic number, because the mean of its divisors is an integer number (10566105129).

Almost surely, 2^21132210257 is an apocalyptic number.

It is an amenable number.

21132210257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132210257 is an equidigital number, since it uses as much as digits as its factorization.

21132210257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 21132210257 its reverse (75201223112), we get a palindrome (96333433369).

The spelling of 21132210257 in words is "twenty-one billion, one hundred thirty-two million, two hundred ten thousand, two hundred fifty-seven".