21211200112001 has 4 divisors (see below), whose sum is σ = 21211661561904. Its totient is φ = 21210738662100.

The previous prime is 21211200111989. The next prime is 21211200112007. The reversal of 21211200112001 is 10021100211212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211200112001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211200112007) 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, 230655995 + ... + 230747936.

It is an arithmetic number, because the mean of its divisors is an integer number (5302915390476).

Almost surely, 2^{21211200112001} is an apocalyptic number.

It is an amenable number.

21211200112001 is a deficient number, since it is larger than the sum of its proper divisors (461449903).

21211200112001 is an equidigital number, since it uses as much as digits as its factorization.

21211200112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461449902.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211200112001 its reverse (10021100211212), we get a palindrome (31232300323213).

The spelling of 21211200112001 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, one hundred twelve thousand, one".