21000120212101 has 8 divisors (see below), whose sum is σ = 21003825167424. Its totient is φ = 20996415602400.

The previous prime is 21000120212089. The next prime is 21000120212111. The reversal of 21000120212101 is 10121202100012.

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 21000120212101 - 2¹⁵ = 21000120179333 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 (21000120212111) 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, 140986201 + ... + 141135073.

It is an arithmetic number, because the mean of its divisors is an integer number (2625478145928).

Almost surely, 2^{21000120212101} is an apocalyptic number.

It is an amenable number.

21000120212101 is a deficient number, since it is larger than the sum of its proper divisors (3704955323).

21000120212101 is a wasteful number, since it uses less digits than its factorization.

21000120212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172811.

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

Adding to 21000120212101 its reverse (10121202100012), we get a palindrome (31121322312113).

The spelling of 21000120212101 in words is "twenty-one trillion, one hundred twenty million, two hundred twelve thousand, one hundred one".