21103123132 has 24 divisors (see below), whose sum is σ = 45452881376. Its totient is φ = 8348488128.

The previous prime is 21103123121. The next prime is 21103123141. The reversal of 21103123132 is 23132130112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28987443 + ... + 28988170.

Almost surely, 2^21103123132 is an apocalyptic number.

It is an amenable number.

21103123132 is an abundant number, since it is smaller than the sum of its proper divisors (24349758244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103123132 is a wasteful number, since it uses less digits than its factorization.

21103123132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57975637 (or 57975635 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21103123132 its reverse (23132130112), we get a palindrome (44235253244).

The spelling of 21103123132 in words is "twenty-one billion, one hundred three million, one hundred twenty-three thousand, one hundred thirty-two".