21129193112 has 32 divisors (see below), whose sum is σ = 40571850000. Its totient is φ = 10310436864.

The previous prime is 21129193061. The next prime is 21129193117. The reversal of 21129193112 is 21139192112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21129193117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405068 + ... + 454244.

Almost surely, 2^21129193112 is an apocalyptic number.

It is an amenable number.

21129193112 is a deficient number, since it is larger than the sum of its proper divisors (19442656888).

21129193112 is a wasteful number, since it uses less digits than its factorization.

21129193112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50475 (or 50471 counting only the distinct ones).

The product of its digits is 1944, while the sum is 32.

It can be divided in two parts, 211291 and 93112, that added together give a palindrome (304403).

The spelling of 21129193112 in words is "twenty-one billion, one hundred twenty-nine million, one hundred ninety-three thousand, one hundred twelve".