21101101027 has 2 divisors, whose sum is σ = 21101101028.
Its totient is φ = 21101101026.
The previous prime is 21101101009. The next prime is 21101101031. The reversal of 21101101027 is 72010110112.
Adding to 21101101027 its reverse (72010110112), we get a palindrome (93111211139).
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 21101101027 - 27 = 21101100899 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 21101101027.
It is not a weakly prime, because it can be changed into another prime (21101101327) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550513 + 10550550514.
It is an arithmetic number, because the mean of its divisors is an integer number (10550550514).
Almost surely, 221101101027 is an apocalyptic number.
21101101027 is a deficient number, since it is larger than the sum of its proper divisors (1).
21101101027 is an equidigital number, since it uses as much as digits as its factorization.
21101101027 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 28, while the sum is 16.
The spelling of 21101101027 in words is "twenty-one billion, one hundred one million, one hundred one thousand, twenty-seven".