21212103232 has 28 divisors (see below), whose sum is σ = 42212055276. Its totient is φ = 10575994880.

The previous prime is 21212103223. The next prime is 21212103233. The reversal of 21212103232 is 23230121212.

It can be written as a sum of positive squares in 2 ways, for example, as 14252539456 + 6959563776 = 119384^2 + 83424^2 .

It is a super-3 number, since 3×21212103232³ (a number of 32 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21212103233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446869 + ... + 492052.

Almost surely, 2^21212103232 is an apocalyptic number.

It is an amenable number.

21212103232 is a deficient number, since it is larger than the sum of its proper divisors (20999952044).

21212103232 is an equidigital number, since it uses as much as digits as its factorization.

21212103232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939286 (or 939276 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21212103232 its reverse (23230121212), we get a palindrome (44442224444).

The spelling of 21212103232 in words is "twenty-one billion, two hundred twelve million, one hundred three thousand, two hundred thirty-two".