21123132112 has 10 divisors (see below), whose sum is σ = 40926068498. Its totient is φ = 10561566048.

The previous prime is 21123132109. The next prime is 21123132157.

21123132112 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 15796467856 + 5326664256 = 125684^2 + 72984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21123132112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660097863 + ... + 660097894.

Almost surely, 2^21123132112 is an apocalyptic number.

It is an amenable number.

21123132112 is a deficient number, since it is larger than the sum of its proper divisors (19802936386).

21123132112 is a wasteful number, since it uses less digits than its factorization.

21123132112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320195765 (or 1320195759 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The spelling of 21123132112 in words is "twenty-one billion, one hundred twenty-three million, one hundred thirty-two thousand, one hundred twelve".