21210212110012 has 24 divisors (see below), whose sum is σ = 37449244765296. Its totient is φ = 10510442412288.

The previous prime is 21210212109979. The next prime is 21210212110019. The reversal of 21210212110012 is 21001121201212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210212110019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4055223 + ... + 7672369.

It is an arithmetic number, because the mean of its divisors is an integer number (1560385198554).

Almost surely, 2^{21210212110012} is an apocalyptic number.

It is an amenable number.

21210212110012 is a deficient number, since it is larger than the sum of its proper divisors (16239032655284).

21210212110012 is a wasteful number, since it uses less digits than its factorization.

21210212110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630237 (or 3630235 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210212110012 its reverse (21001121201212), we get a palindrome (42211333311224).

The spelling of 21210212110012 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred ten thousand, twelve".