21201001222101 has 4 divisors (see below), whose sum is σ = 28268001629472. Its totient is φ = 14134000814732.

The previous prime is 21201001222013. The next prime is 21201001222123. The reversal of 21201001222101 is 10122210010212.

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 21201001222101 - 2⁷ = 21201001221973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201001222301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3533500203681 + ... + 3533500203686.

It is an arithmetic number, because the mean of its divisors is an integer number (7067000407368).

Almost surely, 2^{21201001222101} is an apocalyptic number.

It is an amenable number.

21201001222101 is a deficient number, since it is larger than the sum of its proper divisors (7067000407371).

21201001222101 is an equidigital number, since it uses as much as digits as its factorization.

21201001222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067000407370.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201001222101 its reverse (10122210010212), we get a palindrome (31323211232313).

The spelling of 21201001222101 in words is "twenty-one trillion, two hundred one billion, one million, two hundred twenty-two thousand, one hundred one".