21001000202012 has 6 divisors (see below), whose sum is σ = 36751750353528. Its totient is φ = 10500500101004.

The previous prime is 21001000201999. The next prime is 21001000202023. The reversal of 21001000202012 is 21020200010012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001000201984 and 21001000202002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625125025248 + ... + 2625125025255.

It is an arithmetic number, because the mean of its divisors is an integer number (6125291725588).

Almost surely, 2^{21001000202012} is an apocalyptic number.

It is an amenable number.

21001000202012 is a deficient number, since it is larger than the sum of its proper divisors (15750750151516).

21001000202012 is a wasteful number, since it uses less digits than its factorization.

21001000202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250250050507 (or 5250250050505 counting only the distinct ones).

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

Adding to 21001000202012 its reverse (21020200010012), we get a palindrome (42021200212024).

The spelling of 21001000202012 in words is "twenty-one trillion, one billion, two hundred two thousand, twelve".