21155363153 has 4 divisors (see below), whose sum is σ = 21423152640. Its totient is φ = 20887573668.

The previous prime is 21155363137. The next prime is 21155363161. The reversal of 21155363153 is 35136355112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21155363153 - 2⁴ = 21155363137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21155363353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133894625 + ... + 133894782.

It is an arithmetic number, because the mean of its divisors is an integer number (5355788160).

Almost surely, 2^21155363153 is an apocalyptic number.

It is an amenable number.

21155363153 is a deficient number, since it is larger than the sum of its proper divisors (267789487).

21155363153 is an equidigital number, since it uses as much as digits as its factorization.

21155363153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267789486.

The product of its digits is 40500, while the sum is 35.

The spelling of 21155363153 in words is "twenty-one billion, one hundred fifty-five million, three hundred sixty-three thousand, one hundred fifty-three".