21210102120012 has 48 divisors (see below), whose sum is σ = 55614448377600. Its totient is φ = 6242438081088.

The previous prime is 21210102119813. The next prime is 21210102120013. The reversal of 21210102120012 is 21002120101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210102119973 and 21210102120000.

It is not an unprimeable number, because it can be changed into a prime (21210102120013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2955696262 + ... + 2955703437.

It is an arithmetic number, because the mean of its divisors is an integer number (1158634341200).

Almost surely, 2^{21210102120012} is an apocalyptic number.

It is an amenable number.

21210102120012 is an abundant number, since it is smaller than the sum of its proper divisors (34404346257588).

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

21210102120012 is a wasteful number, since it uses less digits than its factorization.

21210102120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911399742 (or 5911399740 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210102120012 its reverse (21002120101212), we get a palindrome (42212222221224).

The spelling of 21210102120012 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, one hundred twenty thousand, twelve".