21123132104 has 32 divisors (see below), whose sum is σ = 42335879040. Its totient is φ = 9855964800.

The previous prime is 21123132103. The next prime is 21123132109. The reversal of 21123132104 is 40123132112.

It is not an unprimeable number, because it can be changed into a prime (21123132103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1392452 + ... + 1407539.

It is an arithmetic number, because the mean of its divisors is an integer number (1322996220).

Almost surely, 2^21123132104 is an apocalyptic number.

It is an amenable number.

21123132104 is an abundant number, since it is smaller than the sum of its proper divisors (21212746936).

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

21123132104 is a wasteful number, since it uses less digits than its factorization.

21123132104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800061 (or 2800057 counting only the distinct ones).

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

Adding to 21123132104 its reverse (40123132112), we get a palindrome (61246264216).

The spelling of 21123132104 in words is "twenty-one billion, one hundred twenty-three million, one hundred thirty-two thousand, one hundred four".