21021110012 has 48 divisors (see below), whose sum is σ = 42663075840. Its totient is φ = 8876179200.

The previous prime is 21021109979. The next prime is 21021110029. The reversal of 21021110012 is 21001112012.

It is a super-2 number, since 2×21021110012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021109975 and 21021110002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4194164 + ... + 4199172.

It is an arithmetic number, because the mean of its divisors is an integer number (888814080).

Almost surely, 2^21021110012 is an apocalyptic number.

It is an amenable number.

21021110012 is an abundant number, since it is smaller than the sum of its proper divisors (21641965828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021110012 is a wasteful number, since it uses less digits than its factorization.

21021110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7202 (or 7200 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21021110012 its reverse (21001112012), we get a palindrome (42022222024).

The spelling of 21021110012 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, twelve".