21000012100212 has 24 divisors (see below), whose sum is σ = 51578977088800. Its totient is φ = 6631582768416.

The previous prime is 21000012100181. The next prime is 21000012100213. The reversal of 21000012100212 is 21200121000012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000012100213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46052657887 + ... + 46052658342.

Almost surely, 2^{21000012100212} is an apocalyptic number.

It is an amenable number.

21000012100212 is an abundant number, since it is smaller than the sum of its proper divisors (30578964988588).

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

21000012100212 is a wasteful number, since it uses less digits than its factorization.

21000012100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92105316255 (or 92105316253 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000012100212 its reverse (21200121000012), we get a palindrome (42200133100224).

The spelling of 21000012100212 in words is "twenty-one trillion, twelve million, one hundred thousand, two hundred twelve".