21201110202001 has 4 divisors (see below), whose sum is σ = 22122897602112. Its totient is φ = 20279322801892.

The previous prime is 21201110201981. The next prime is 21201110202091. The reversal of 21201110202001 is 10020201110212.

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 not a de Polignac number, because 21201110202001 - 2²¹ = 21201108104849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201110202091) 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, 460893700021 + ... + 460893700066.

It is an arithmetic number, because the mean of its divisors is an integer number (5530724400528).

Almost surely, 2^{21201110202001} is an apocalyptic number.

It is an amenable number.

21201110202001 is a deficient number, since it is larger than the sum of its proper divisors (921787400111).

21201110202001 is an equidigital number, since it uses as much as digits as its factorization.

21201110202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921787400110.

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

Adding to 21201110202001 its reverse (10020201110212), we get a palindrome (31221311312213).

The spelling of 21201110202001 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred two thousand, one".