21000211111212 has 24 divisors (see below), whose sum is σ = 50324830231536. Its totient is φ = 6810879279168.

The previous prime is 21000211111193. The next prime is 21000211111219. The reversal of 21000211111212 is 21211111200012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21000211111191 and 21000211111200.

It is not an unprimeable number, because it can be changed into a prime (21000211111219) 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, 23648885943 + ... + 23648886830.

It is an arithmetic number, because the mean of its divisors is an integer number (2096867926314).

Almost surely, 2^{21000211111212} is an apocalyptic number.

It is an amenable number.

21000211111212 is an abundant number, since it is smaller than the sum of its proper divisors (29324619120324).

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

21000211111212 is a wasteful number, since it uses less digits than its factorization.

21000211111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47297772817 (or 47297772815 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21000211111212 its reverse (21211111200012), we get a palindrome (42211322311224).

The spelling of 21000211111212 in words is "twenty-one trillion, two hundred eleven million, one hundred eleven thousand, two hundred twelve".