21221201212027 has 2 divisors, whose sum is σ = 21221201212028. Its totient is φ = 21221201212026.

The previous prime is 21221201212007. The next prime is 21221201212061. The reversal of 21221201212027 is 72021210212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221201212027 - 2²⁷ = 21221066994299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221201211992 and 21221201212010.

It is not a weakly prime, because it can be changed into another prime (21221201212007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610600606013 + 10610600606014.

It is an arithmetic number, because the mean of its divisors is an integer number (10610600606014).

Almost surely, 2^{21221201212027} is an apocalyptic number.

21221201212027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221201212027 is an equidigital number, since it uses as much as digits as its factorization.

21221201212027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 21221201212027 its reverse (72021210212212), we get a palindrome (93242411424239).

The spelling of 21221201212027 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, twenty-seven".