21012010100101 has 8 divisors (see below), whose sum is σ = 21459885528960. Its totient is φ = 20564168479008.

The previous prime is 21012010100099. The next prime is 21012010100173. The reversal of 21012010100101 is 10100101021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012010100101 - 2¹ = 21012010100099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012010100701) 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 in 7 ways as a sum of consecutive naturals, for example, 7193691 + ... + 9683656.

It is an arithmetic number, because the mean of its divisors is an integer number (2682485691120).

Almost surely, 2^{21012010100101} is an apocalyptic number.

It is an amenable number.

21012010100101 is a deficient number, since it is larger than the sum of its proper divisors (447875428859).

21012010100101 is a wasteful number, since it uses less digits than its factorization.

21012010100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16903883.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21012010100101 its reverse (10100101021012), we get a palindrome (31112111121113).

The spelling of 21012010100101 in words is "twenty-one trillion, twelve billion, ten million, one hundred thousand, one hundred one".