21212123132 has 12 divisors (see below), whose sum is σ = 37170000336. Its totient is φ = 10592123040.

The previous prime is 21212123123. The next prime is 21212123159. The reversal of 21212123132 is 23132121212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481208 + ... + 3487295.

It is an arithmetic number, because the mean of its divisors is an integer number (3097500028).

Almost surely, 2^21212123132 is an apocalyptic number.

It is an amenable number.

21212123132 is a deficient number, since it is larger than the sum of its proper divisors (15957877204).

21212123132 is a wasteful number, since it uses less digits than its factorization.

21212123132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6969268 (or 6969266 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 21212123132 its reverse (23132121212), we get a palindrome (44344244344).

The spelling of 21212123132 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-three thousand, one hundred thirty-two".