21104134153 has 2 divisors, whose sum is σ = 21104134154. Its totient is φ = 21104134152.

The previous prime is 21104134141. The next prime is 21104134171. The reversal of 21104134153 is 35143140112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18303925264 + 2800208889 = 135292^2 + 52917^2 .

It is a cyclic number.

It is not a de Polignac number, because 21104134153 - 2⁹ = 21104133641 is a prime.

It is not a weakly prime, because it can be changed into another prime (21104134553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552067076 + 10552067077.

It is an arithmetic number, because the mean of its divisors is an integer number (10552067077).

Almost surely, 2^21104134153 is an apocalyptic number.

It is an amenable number.

21104134153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104134153 is an equidigital number, since it uses as much as digits as its factorization.

21104134153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21104134153 its reverse (35143140112), we get a palindrome (56247274265).

The spelling of 21104134153 in words is "twenty-one billion, one hundred four million, one hundred thirty-four thousand, one hundred fifty-three".