21211000212 has 48 divisors (see below), whose sum is σ = 50845112640. Its totient is φ = 6877193472.

The previous prime is 21211000211. The next prime is 21211000267. The reversal of 21211000212 is 21200011212.

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 (21211000211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2400739 + ... + 2409557.

It is an arithmetic number, because the mean of its divisors is an integer number (1059273180).

Almost surely, 2^21211000212 is an apocalyptic number.

It is an amenable number.

21211000212 is an abundant number, since it is smaller than the sum of its proper divisors (29634112428).

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

21211000212 is a wasteful number, since it uses less digits than its factorization.

21211000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14280 (or 14278 counting only the distinct ones).

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

Adding to 21211000212 its reverse (21200011212), we get a palindrome (42411011424).

It can be divided in two parts, 21211000 and 212, that added together give a palindrome (21211212).

The spelling of 21211000212 in words is "twenty-one billion, two hundred eleven million, two hundred twelve", and thus it is an aban number.