21001002002012 has 12 divisors (see below), whose sum is σ = 38019055348680. Its totient is φ = 10138414759536.

The previous prime is 21001002001951. The next prime is 21001002002039. The reversal of 21001002002012 is 21020020010012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001002001984 and 21001002002002.

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, 90521560238 + ... + 90521560469.

It is an arithmetic number, because the mean of its divisors is an integer number (3168254612390).

Almost surely, 2^{21001002002012} is an apocalyptic number.

It is an amenable number.

21001002002012 is a deficient number, since it is larger than the sum of its proper divisors (17018053346668).

21001002002012 is a wasteful number, since it uses less digits than its factorization.

21001002002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181043120740 (or 181043120738 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001002002012 its reverse (21020020010012), we get a palindrome (42021022012024).

The spelling of 21001002002012 in words is "twenty-one trillion, one billion, two million, two thousand, twelve".