21000101212201 has 4 divisors (see below), whose sum is σ = 21000125458692. Its totient is φ = 21000076965712.

The previous prime is 21000101212177. The next prime is 21000101212229. The reversal of 21000101212201 is 10221210100012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4122991165225 + 16877110046976 = 2030515^2 + 4108176^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000101212201 - 2¹⁷ = 21000101081129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000101212241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10774030 + ... + 12572983.

It is an arithmetic number, because the mean of its divisors is an integer number (5250031364673).

Almost surely, 2^{21000101212201} is an apocalyptic number.

It is an amenable number.

21000101212201 is a deficient number, since it is larger than the sum of its proper divisors (24246491).

21000101212201 is an equidigital number, since it uses as much as digits as its factorization.

21000101212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24246490.

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

Adding to 21000101212201 its reverse (10221210100012), we get a palindrome (31221311312213).

The spelling of 21000101212201 in words is "twenty-one trillion, one hundred one million, two hundred twelve thousand, two hundred one".