21315232213 has 32 divisors (see below), whose sum is σ = 26468259840. Its totient is φ = 16910012160.

The previous prime is 21315232189. The next prime is 21315232231. The reversal of 21315232213 is 31223251312.

It is not a de Polignac number, because 21315232213 - 2⁵ = 21315232181 is a prime.

It is a super-2 number, since 2×21315232213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315232243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103170 + ... + 230812.

It is an arithmetic number, because the mean of its divisors is an integer number (827133120).

Almost surely, 2^21315232213 is an apocalyptic number.

It is an amenable number.

21315232213 is a deficient number, since it is larger than the sum of its proper divisors (5153027627).

21315232213 is a wasteful number, since it uses less digits than its factorization.

21315232213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127737.

The product of its digits is 2160, while the sum is 25.

Adding to 21315232213 its reverse (31223251312), we get a palindrome (52538483525).

The spelling of 21315232213 in words is "twenty-one billion, three hundred fifteen million, two hundred thirty-two thousand, two hundred thirteen".