21012210201212 has 6 divisors (see below), whose sum is σ = 36771367852128. Its totient is φ = 10506105100604.

The previous prime is 21012210201187. The next prime is 21012210201287. The reversal of 21012210201212 is 21210201221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626526275148 + ... + 2626526275155.

It is an arithmetic number, because the mean of its divisors is an integer number (6128561308688).

Almost surely, 2^{21012210201212} is an apocalyptic number.

It is an amenable number.

21012210201212 is a deficient number, since it is larger than the sum of its proper divisors (15759157650916).

21012210201212 is a wasteful number, since it uses less digits than its factorization.

21012210201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5253052550307 (or 5253052550305 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012210201212 its reverse (21210201221012), we get a palindrome (42222411422224).

The spelling of 21012210201212 in words is "twenty-one trillion, twelve billion, two hundred ten million, two hundred one thousand, two hundred twelve".