21210100001012 has 48 divisors (see below), whose sum is σ = 42328506048192. Its totient is φ = 9212505546240.

The previous prime is 21210100000909. The next prime is 21210100001147. The reversal of 21210100001012 is 21010000101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210100000984 and 21210100001002.

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, 7571003 + ... + 9987005.

It is an arithmetic number, because the mean of its divisors is an integer number (881843876004).

Almost surely, 2^{21210100001012} is an apocalyptic number.

It is an amenable number.

21210100001012 is a deficient number, since it is larger than the sum of its proper divisors (21118406047180).

21210100001012 is a wasteful number, since it uses less digits than its factorization.

21210100001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425968 (or 2425966 counting only the distinct ones).

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

Adding to 21210100001012 its reverse (21010000101212), we get a palindrome (42220100102224).

The spelling of 21210100001012 in words is "twenty-one trillion, two hundred ten billion, one hundred million, one thousand, twelve".