221102020001 has 2 divisors, whose sum is σ = 221102020002. Its totient is φ = 221102020000.

The previous prime is 221102019979. The next prime is 221102020003. The reversal of 221102020001 is 100020201122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220595544976 + 506475025 = 469676^2 + 22505^2 .

It is a cyclic number.

It is not a de Polignac number, because 221102020001 - 2²⁶ = 221034911137 is a prime.

It is a super-2 number, since 2×221102020001² (a number of 23 digits) contains 22 as substring.

Together with 221102020003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221102020003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551010000 + 110551010001.

It is an arithmetic number, because the mean of its divisors is an integer number (110551010001).

Almost surely, 2^221102020001 is an apocalyptic number.

It is an amenable number.

221102020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102020001 is an equidigital number, since it uses as much as digits as its factorization.

221102020001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221102020001 its reverse (100020201122), we get a palindrome (321122221123).

The spelling of 221102020001 in words is "two hundred twenty-one billion, one hundred two million, twenty thousand, one".