21000000001012 has 96 divisors (see below), whose sum is σ = 39639959004800. Its totient is φ = 9704549150208.

The previous prime is 21000000001003. The next prime is 21000000001027. The reversal of 21000000001012 is 21010000000012.

It is a junction number, because it is equal to n+sod(n) for n = 21000000000986 and 21000000001004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1419199198 + ... + 1419213994.

Almost surely, 2^{21000000001012} is an apocalyptic number.

It is an amenable number.

21000000001012 is a deficient number, since it is larger than the sum of its proper divisors (18639959003788).

21000000001012 is a wasteful number, since it uses less digits than its factorization.

21000000001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17553 (or 17551 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000000001012 its reverse (21010000000012), we get a palindrome (42010000001024).

The spelling of 21000000001012 in words is "twenty-one trillion, one thousand, twelve".