21021220212227 has 2 divisors, whose sum is σ = 21021220212228. Its totient is φ = 21021220212226.

The previous prime is 21021220212143. The next prime is 21021220212253. The reversal of 21021220212227 is 72221202212012.

It is an a-pointer prime, because the next prime (21021220212253) can be obtained adding 21021220212227 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021220212227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021220212196 and 21021220212205.

It is not a weakly prime, because it can be changed into another prime (21021220212527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510610106113 + 10510610106114.

It is an arithmetic number, because the mean of its divisors is an integer number (10510610106114).

Almost surely, 2^{21021220212227} is an apocalyptic number.

21021220212227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021220212227 is an equidigital number, since it uses as much as digits as its factorization.

21021220212227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

Adding to 21021220212227 its reverse (72221202212012), we get a palindrome (93242422424239).

The spelling of 21021220212227 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-seven".