21101027 has 2 divisors, whose sum is σ = 21101028. Its totient is φ = 21101026.

The previous prime is 21100999. The next prime is 21101033. The reversal of 21101027 is 72010112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101027 - 2¹⁰ = 21100003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21107027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550513 + 10550514.

It is an arithmetic number, because the mean of its divisors is an integer number (10550514).

Almost surely, 2^21101027 is an apocalyptic number.

21101027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101027 is an equidigital number, since it uses as much as digits as its factorization.

21101027 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 14.

The square root of 21101027 is about 4593.5854188205. The cubic root of 21101027 is about 276.3341320157.

Adding to 21101027 its reverse (72010112), we get a palindrome (93111139).

The spelling of 21101027 in words is "twenty-one million, one hundred one thousand, twenty-seven".