21132232213 has 2 divisors, whose sum is σ = 21132232214. Its totient is φ = 21132232212.

The previous prime is 21132232201. The next prime is 21132232229. The reversal of 21132232213 is 31223223112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18187759044 + 2944473169 = 134862^2 + 54263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21132232213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132232273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566116106 + 10566116107.

It is an arithmetic number, because the mean of its divisors is an integer number (10566116107).

Almost surely, 2^21132232213 is an apocalyptic number.

It is an amenable number.

21132232213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132232213 is an equidigital number, since it uses as much as digits as its factorization.

21132232213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

Adding to 21132232213 its reverse (31223223112), we get a palindrome (52355455325).

The spelling of 21132232213 in words is "twenty-one billion, one hundred thirty-two million, two hundred thirty-two thousand, two hundred thirteen".