21121021010027 has 2 divisors, whose sum is σ = 21121021010028. Its totient is φ = 21121021010026.

The previous prime is 21121021009993. The next prime is 21121021010039. The reversal of 21121021010027 is 72001012012112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121021010027 - 2⁸ = 21121021009771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121021009990 and 21121021010008.

It is not a weakly prime, because it can be changed into another prime (21121021016027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560510505013 + 10560510505014.

It is an arithmetic number, because the mean of its divisors is an integer number (10560510505014).

Almost surely, 2^{21121021010027} is an apocalyptic number.

21121021010027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121021010027 is an equidigital number, since it uses as much as digits as its factorization.

21121021010027 is an evil number, because the sum of its binary digits is even.

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

Adding to 21121021010027 its reverse (72001012012112), we get a palindrome (93122033022139).

The spelling of 21121021010027 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, ten thousand, twenty-seven".