21155164243133 has 32 divisors (see below), whose sum is σ = 23068227168000. Its totient is φ = 19323988992000.

The previous prime is 21155164243127. The next prime is 21155164243141. The reversal of 21155164243133 is 33134246155112.

It is not a de Polignac number, because 21155164243133 - 2⁴ = 21155164243117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155164243153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1322107133 + ... + 1322123133.

It is an arithmetic number, because the mean of its divisors is an integer number (720882099000).

Almost surely, 2^{21155164243133} is an apocalyptic number.

It is an amenable number.

21155164243133 is a deficient number, since it is larger than the sum of its proper divisors (1913062924867).

21155164243133 is a wasteful number, since it uses less digits than its factorization.

21155164243133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19205.

The product of its digits is 259200, while the sum is 41.

The spelling of 21155164243133 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-four million, two hundred forty-three thousand, one hundred thirty-three".