21001102022201 has 4 divisors (see below), whose sum is σ = 24001259453952. Its totient is φ = 18000944590452.

The previous prime is 21001102022191. The next prime is 21001102022269. The reversal of 21001102022201 is 10222020110012.

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 21001102022201 - 2¹⁰ = 21001102021177 is a prime.

It is a super-2 number, since 2×21001102022201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001102012201) 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, 1500078715865 + ... + 1500078715878.

It is an arithmetic number, because the mean of its divisors is an integer number (6000314863488).

Almost surely, 2^{21001102022201} is an apocalyptic number.

It is an amenable number.

21001102022201 is a deficient number, since it is larger than the sum of its proper divisors (3000157431751).

21001102022201 is an equidigital number, since it uses as much as digits as its factorization.

21001102022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000157431750.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001102022201 its reverse (10222020110012), we get a palindrome (31223122132213).

The spelling of 21001102022201 in words is "twenty-one trillion, one billion, one hundred two million, twenty-two thousand, two hundred one".