21212022012212 has 12 divisors (see below), whose sum is σ = 37388096353440. Its totient is φ = 10529708768376.

The previous prime is 21212022012163. The next prime is 21212022012227. The reversal of 21212022012212 is 21221022021212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19075558808 + ... + 19075559919.

It is an arithmetic number, because the mean of its divisors is an integer number (3115674696120).

Almost surely, 2^{21212022012212} is an apocalyptic number.

It is an amenable number.

21212022012212 is a deficient number, since it is larger than the sum of its proper divisors (16176074341228).

21212022012212 is a wasteful number, since it uses less digits than its factorization.

21212022012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38151118870 (or 38151118868 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212022012212 its reverse (21221022021212), we get a palindrome (42433044033424).

The spelling of 21212022012212 in words is "twenty-one trillion, two hundred twelve billion, twenty-two million, twelve thousand, two hundred twelve".