21221110012 has 12 divisors (see below), whose sum is σ = 37141072696. Its totient is φ = 10609374960.

The previous prime is 21221110003. The next prime is 21221110037. The reversal of 21221110012 is 21001112212.

It is a junction number, because it is equal to n+sod(n) for n = 21221109974 and 21221110001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253914 + ... + 326977.

Almost surely, 2^21221110012 is an apocalyptic number.

It is an amenable number.

21221110012 is a deficient number, since it is larger than the sum of its proper divisors (15919962684).

21221110012 is a wasteful number, since it uses less digits than its factorization.

21221110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590028 (or 590026 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221110012 its reverse (21001112212), we get a palindrome (42222222224).

The spelling of 21221110012 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, twelve".