21155161313 has 8 divisors (see below), whose sum is σ = 24853616256. Its totient is φ = 17752582800.

The previous prime is 21155161297. The next prime is 21155161333. The reversal of 21155161313 is 31316155112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21155161313 - 2⁴ = 21155161297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21155161333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73968953 + ... + 73969238.

It is an arithmetic number, because the mean of its divisors is an integer number (3106702032).

Almost surely, 2^21155161313 is an apocalyptic number.

It is an amenable number.

21155161313 is a deficient number, since it is larger than the sum of its proper divisors (3698454943).

21155161313 is a wasteful number, since it uses less digits than its factorization.

21155161313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147938215.

The product of its digits is 2700, while the sum is 29.

The spelling of 21155161313 in words is "twenty-one billion, one hundred fifty-five million, one hundred sixty-one thousand, three hundred thirteen".