21021021100012 has 12 divisors (see below), whose sum is σ = 36786830575600. Its totient is φ = 10510498078416.

The previous prime is 21021021100007. The next prime is 21021021100033. The reversal of 21021021100012 is 21000112012012.

It is a junction number, because it is equal to n+sod(n) for n = 21021021099965 and 21021021100001.

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, 1402798 + ... + 6633994.

Almost surely, 2^{21021021100012} is an apocalyptic number.

It is an amenable number.

21021021100012 is a deficient number, since it is larger than the sum of its proper divisors (15765809475588).

21021021100012 is a wasteful number, since it uses less digits than its factorization.

21021021100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235800 (or 6235798 counting only the distinct ones).

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

Adding to 21021021100012 its reverse (21000112012012), we get a palindrome (42021133112024).

The spelling of 21021021100012 in words is "twenty-one trillion, twenty-one billion, twenty-one million, one hundred thousand, twelve".