21210212001212 has 48 divisors (see below), whose sum is σ = 40956572923392. Its totient is φ = 9548575557120.

The previous prime is 21210212001203. The next prime is 21210212001217. The reversal of 21210212001212 is 21210021201212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210212001217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9227813 + ... + 11294819.

It is an arithmetic number, because the mean of its divisors is an integer number (853261935904).

Almost surely, 2^{21210212001212} is an apocalyptic number.

It is an amenable number.

21210212001212 is a deficient number, since it is larger than the sum of its proper divisors (19746360922180).

21210212001212 is a wasteful number, since it uses less digits than its factorization.

21210212001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071878 (or 2071876 counting only the distinct ones).

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

Adding to 21210212001212 its reverse (21210021201212), we get a palindrome (42420233202424).

The spelling of 21210212001212 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one thousand, two hundred twelve".