21103232012 has 6 divisors (see below), whose sum is σ = 36930656028. Its totient is φ = 10551616004.

The previous prime is 21103232011. The next prime is 21103232023. The reversal of 21103232012 is 21023230112.

It is not an unprimeable number, because it can be changed into a prime (21103232011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637903998 + ... + 2637904005.

It is an arithmetic number, because the mean of its divisors is an integer number (6155109338).

Almost surely, 2^21103232012 is an apocalyptic number.

It is an amenable number.

21103232012 is a deficient number, since it is larger than the sum of its proper divisors (15827424016).

21103232012 is a wasteful number, since it uses less digits than its factorization.

21103232012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275808007 (or 5275808005 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21103232012 its reverse (21023230112), we get a palindrome (42126462124).

The spelling of 21103232012 in words is "twenty-one billion, one hundred three million, two hundred thirty-two thousand, twelve".