21012100102212 has 72 divisors (see below), whose sum is σ = 49884376071936. Its totient is φ = 6883792549056.

The previous prime is 21012100102051. The next prime is 21012100102241. The reversal of 21012100102212 is 21220100121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012100102191 and 21012100102200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196400238 + ... + 196507194.

Almost surely, 2^{21012100102212} is an apocalyptic number.

It is an amenable number.

21012100102212 is an abundant number, since it is smaller than the sum of its proper divisors (28872275969724).

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

21012100102212 is a wasteful number, since it uses less digits than its factorization.

21012100102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111785 (or 111724 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012100102212 its reverse (21220100121012), we get a palindrome (42232200223224).

The spelling of 21012100102212 in words is "twenty-one trillion, twelve billion, one hundred million, one hundred two thousand, two hundred twelve".