21012012100101 has 16 divisors (see below), whose sum is σ = 30563009745408. Its totient is φ = 12734518182000.

The previous prime is 21012012100087. The next prime is 21012012100117. The reversal of 21012012100101 is 10100121021012.

It is not a de Polignac number, because 21012012100101 - 2⁷ = 21012012099973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012012104101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16918360 + ... + 18117806.

It is an arithmetic number, because the mean of its divisors is an integer number (1910188109088).

Almost surely, 2^{21012012100101} is an apocalyptic number.

It is an amenable number.

21012012100101 is a deficient number, since it is larger than the sum of its proper divisors (9550997645307).

21012012100101 is a wasteful number, since it uses less digits than its factorization.

21012012100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730312.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21012012100101 its reverse (10100121021012), we get a palindrome (31112133121113).

The spelling of 21012012100101 in words is "twenty-one trillion, twelve billion, twelve million, one hundred thousand, one hundred one".