21000001112201 has 4 divisors (see below), whose sum is σ = 21004364300292. Its totient is φ = 20995637924112.

The previous prime is 21000001112183. The next prime is 21000001112213. The reversal of 21000001112201 is 10221110000012.

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 6224426214400 + 14775574897801 = 2494880^2 + 3843901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000001112201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000001162201) 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, 2181586826 + ... + 2181596451.

It is an arithmetic number, because the mean of its divisors is an integer number (5251091075073).

Almost surely, 2^{21000001112201} is an apocalyptic number.

It is an amenable number.

21000001112201 is a deficient number, since it is larger than the sum of its proper divisors (4363188091).

21000001112201 is an equidigital number, since it uses as much as digits as its factorization.

21000001112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363188090.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000001112201 its reverse (10221110000012), we get a palindrome (31221111112213).

The spelling of 21000001112201 in words is "twenty-one trillion, one million, one hundred twelve thousand, two hundred one".