21001001212012 has 6 divisors (see below), whose sum is σ = 36751752121028. Its totient is φ = 10500500606004.

The previous prime is 21001001211887. The next prime is 21001001212019. The reversal of 21001001212012 is 21021210010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001001211983 and 21001001212001.

It is not an unprimeable number, because it can be changed into a prime (21001001212019) 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 as a sum of consecutive naturals, namely, 2625125151498 + ... + 2625125151505.

Almost surely, 2^{21001001212012} is an apocalyptic number.

It is an amenable number.

21001001212012 is a deficient number, since it is larger than the sum of its proper divisors (15750750909016).

21001001212012 is a wasteful number, since it uses less digits than its factorization.

21001001212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250250303007 (or 5250250303005 counting only the distinct ones).

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

Adding to 21001001212012 its reverse (21021210010012), we get a palindrome (42022211222024).

The spelling of 21001001212012 in words is "twenty-one trillion, one billion, one million, two hundred twelve thousand, twelve".