21001021222183 has 2 divisors, whose sum is σ = 21001021222184. Its totient is φ = 21001021222182.

The previous prime is 21001021222123. The next prime is 21001021222249. The reversal of 21001021222183 is 38122212010012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001021222183 - 2²⁹ = 21000484351271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001021222123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500510611091 + 10500510611092.

It is an arithmetic number, because the mean of its divisors is an integer number (10500510611092).

Almost surely, 2^{21001021222183} is an apocalyptic number.

21001021222183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001021222183 is an equidigital number, since it uses as much as digits as its factorization.

21001021222183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 21001021222183 its reverse (38122212010012), we get a palindrome (59123233232195).

The spelling of 21001021222183 in words is "twenty-one trillion, one billion, twenty-one million, two hundred twenty-two thousand, one hundred eighty-three".