21022220211001 has 4 divisors (see below), whose sum is σ = 21024909513972. Its totient is φ = 21019530908032.

The previous prime is 21022220210963. The next prime is 21022220211019. The reversal of 21022220211001 is 10011202222012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10574463385600 + 10447756825401 = 3251840^2 + 3232299^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022220211001 - 2¹¹ = 21022220208953 is a prime.

It is a super-2 number, since 2×21022220211001² (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 (21022220211401) 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, 1344639760 + ... + 1344655393.

It is an arithmetic number, because the mean of its divisors is an integer number (5256227378493).

Almost surely, 2^{21022220211001} is an apocalyptic number.

It is an amenable number.

21022220211001 is a deficient number, since it is larger than the sum of its proper divisors (2689302971).

21022220211001 is an equidigital number, since it uses as much as digits as its factorization.

21022220211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689302970.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21022220211001 its reverse (10011202222012), we get a palindrome (31033422433013).

The spelling of 21022220211001 in words is "twenty-one trillion, twenty-two billion, two hundred twenty million, two hundred eleven thousand, one".