21231112102 has 4 divisors (see below), whose sum is σ = 31846668156. Its totient is φ = 10615556050.

The previous prime is 21231112093. The next prime is 21231112109. The reversal of 21231112102 is 20121113212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231112109) 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 as a sum of consecutive naturals, namely, 5307778024 + ... + 5307778027.

It is an arithmetic number, because the mean of its divisors is an integer number (7961667039).

Almost surely, 2^21231112102 is an apocalyptic number.

21231112102 is a deficient number, since it is larger than the sum of its proper divisors (10615556054).

21231112102 is a wasteful number, since it uses less digits than its factorization.

21231112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615556053.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21231112102 its reverse (20121113212), we get a palindrome (41352225314).

The spelling of 21231112102 in words is "twenty-one billion, two hundred thirty-one million, one hundred twelve thousand, one hundred two".