21112101201001 has 4 divisors (see below), whose sum is σ = 21112112661904. Its totient is φ = 21112089740100.

The previous prime is 21112101200999. The next prime is 21112101201007. The reversal of 21112101201001 is 10010210121112.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21112101201001 - 2¹ = 21112101200999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112101201007) 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, 2271255 + ... + 6883516.

It is an arithmetic number, because the mean of its divisors is an integer number (5278028165476).

Almost surely, 2^{21112101201001} is an apocalyptic number.

It is an amenable number.

21112101201001 is a deficient number, since it is larger than the sum of its proper divisors (11460903).

21112101201001 is an equidigital number, since it uses as much as digits as its factorization.

21112101201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11460902.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21112101201001 its reverse (10010210121112), we get a palindrome (31122311322113).

The spelling of 21112101201001 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, two hundred one thousand, one".