21212210000212 has 48 divisors (see below), whose sum is σ = 49003608140928. Its totient is φ = 7778350494720.

The previous prime is 21212210000197. The next prime is 21212210000231. The reversal of 21212210000212 is 21200001221212.

It is a happy number.

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, 2025606873 + ... + 2025617344.

It is an arithmetic number, because the mean of its divisors is an integer number (1020908502936).

Almost surely, 2^{21212210000212} is an apocalyptic number.

21212210000212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212210000212 is an abundant number, since it is smaller than the sum of its proper divisors (27791398140716).

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

21212210000212 is a wasteful number, since it uses less digits than its factorization.

21212210000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051224256 (or 4051224254 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212210000212 its reverse (21200001221212), we get a palindrome (42412211221424).

The spelling of 21212210000212 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, two hundred twelve", and thus it is an aban number.