21100220227 has 2 divisors, whose sum is σ = 21100220228. Its totient is φ = 21100220226.

The previous prime is 21100220201. The next prime is 21100220231. The reversal of 21100220227 is 72202200112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100220227 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100220257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550110113 + 10550110114.

It is an arithmetic number, because the mean of its divisors is an integer number (10550110114).

Almost surely, 2^21100220227 is an apocalyptic number.

21100220227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100220227 is an equidigital number, since it uses as much as digits as its factorization.

21100220227 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 21100220227 its reverse (72202200112), we get a palindrome (93302420339).

The spelling of 21100220227 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, two hundred twenty-seven".