21210120001012 has 12 divisors (see below), whose sum is σ = 37121150406340. Its totient is φ = 10604077027776.

The previous prime is 21210120000983. The next prime is 21210120001027. The reversal of 21210120001012 is 21010002101212.

It can be written as a sum of positive squares in 2 ways, for example, as 3850597742436 + 17359522258576 = 1962294^2 + 4166476^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21210120000983 and 21210120001001.

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, 245694633 + ... + 245780944.

Almost surely, 2^{21210120001012} is an apocalyptic number.

It is an amenable number.

21210120001012 is a deficient number, since it is larger than the sum of its proper divisors (15911030405328).

21210120001012 is a wasteful number, since it uses less digits than its factorization.

21210120001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491486370 (or 491486368 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210120001012 its reverse (21010002101212), we get a palindrome (42220122102224).

The spelling of 21210120001012 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one thousand, twelve".