21220132012 has 12 divisors (see below), whose sum is σ = 37156070896. Its totient is φ = 10604111760.

The previous prime is 21220132009. The next prime is 21220132061. The reversal of 21220132012 is 21023102212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1480539 + ... + 1494802.

Almost surely, 2^21220132012 is an apocalyptic number.

It is an amenable number.

21220132012 is a deficient number, since it is larger than the sum of its proper divisors (15935938884).

21220132012 is a wasteful number, since it uses less digits than its factorization.

21220132012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977128 (or 2977126 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21220132012 its reverse (21023102212), we get a palindrome (42243234224).

The spelling of 21220132012 in words is "twenty-one billion, two hundred twenty million, one hundred thirty-two thousand, twelve".