21221101010027 has 2 divisors, whose sum is σ = 21221101010028. Its totient is φ = 21221101010026.

The previous prime is 21221101009993. The next prime is 21221101010069. The reversal of 21221101010027 is 72001010112212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221101010027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221101009990 and 21221101010008.

It is not a weakly prime, because it can be changed into another prime (21221151010027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610550505013 + 10610550505014.

It is an arithmetic number, because the mean of its divisors is an integer number (10610550505014).

Almost surely, 2^{21221101010027} is an apocalyptic number.

21221101010027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221101010027 is an equidigital number, since it uses as much as digits as its factorization.

21221101010027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21221101010027 its reverse (72001010112212), we get a palindrome (93222111122239).

The spelling of 21221101010027 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, ten thousand, twenty-seven".