21212001121012 has 12 divisors (see below), whose sum is σ = 39976463651236. Its totient is φ = 9790154363520.

The previous prime is 21212001120931. The next prime is 21212001121033. The reversal of 21212001121012 is 21012110021212.

21212001121012 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4978628288656 + 16233372832356 = 2231284^2 + 4029066^2 .

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, 203961549189 + ... + 203961549292.

Almost surely, 2^{21212001121012} is an apocalyptic number.

It is an amenable number.

21212001121012 is a deficient number, since it is larger than the sum of its proper divisors (18764462530224).

21212001121012 is a wasteful number, since it uses less digits than its factorization.

21212001121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407923098498 (or 407923098496 counting only the distinct ones).

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

Adding to 21212001121012 its reverse (21012110021212), we get a palindrome (42224111142224).

The spelling of 21212001121012 in words is "twenty-one trillion, two hundred twelve billion, one million, one hundred twenty-one thousand, twelve".