21021321110012 has 12 divisors (see below), whose sum is σ = 38386760288016. Its totient is φ = 10053675313440.

The previous prime is 21021321109993. The next prime is 21021321110059. The reversal of 21021321110012 is 21001112312012.

It is a happy number.

It is a super-2 number, since 2×21021321110012² (a number of 27 digits) contains 22 as substring.

It is a congruent 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, 114246310289 + ... + 114246310472.

It is an arithmetic number, because the mean of its divisors is an integer number (3198896690668).

Almost surely, 2^{21021321110012} is an apocalyptic number.

It is an amenable number.

21021321110012 is a deficient number, since it is larger than the sum of its proper divisors (17365439178004).

21021321110012 is a wasteful number, since it uses less digits than its factorization.

21021321110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228492620788 (or 228492620786 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21021321110012 its reverse (21001112312012), we get a palindrome (42022433422024).

The spelling of 21021321110012 in words is "twenty-one trillion, twenty-one billion, three hundred twenty-one million, one hundred ten thousand, twelve".