21000020012227 has 2 divisors, whose sum is σ = 21000020012228. Its totient is φ = 21000020012226.

The previous prime is 21000020012197. The next prime is 21000020012239. The reversal of 21000020012227 is 72221002000012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000020012227 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000020019227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500010006113 + 10500010006114.

It is an arithmetic number, because the mean of its divisors is an integer number (10500010006114).

Almost surely, 2^{21000020012227} is an apocalyptic number.

21000020012227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000020012227 is an equidigital number, since it uses as much as digits as its factorization.

21000020012227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 21000020012227 its reverse (72221002000012), we get a palindrome (93221022012239).

The spelling of 21000020012227 in words is "twenty-one trillion, twenty million, twelve thousand, two hundred twenty-seven".