21002101102012 has 24 divisors (see below), whose sum is σ = 38051486550000. Its totient is φ = 10130827639296.

The previous prime is 21002101101991. The next prime is 21002101102019. The reversal of 21002101102012 is 21020110120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002101101983 and 21002101102001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002101102019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72334138 + ... + 72623905.

It is an arithmetic number, because the mean of its divisors is an integer number (1585478606250).

Almost surely, 2^{21002101102012} is an apocalyptic number.

It is an amenable number.

21002101102012 is a deficient number, since it is larger than the sum of its proper divisors (17049385447988).

21002101102012 is a wasteful number, since it uses less digits than its factorization.

21002101102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144959325 (or 144959323 counting only the distinct ones).

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

Adding to 21002101102012 its reverse (21020110120012), we get a palindrome (42022211222024).

The spelling of 21002101102012 in words is "twenty-one trillion, two billion, one hundred one million, one hundred two thousand, twelve".