21158236133145 has 12 divisors (see below), whose sum is σ = 36674275964196. Its totient is φ = 11284392604320.

The previous prime is 21158236133107. The next prime is 21158236133183. The reversal of 21158236133145 is 54133163285112.

21158236133145 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 8 + 23 + 613 + 3 + 1 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21158236133107) and next prime (21158236133183).

It can be written as a sum of positive squares in 2 ways, for example, as 7191691883289 + 13966544249856 = 2681733^2 + 3737184^2 .

It is not a de Polignac number, because 21158236133145 - 2¹⁴ = 21158236116761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 470183025181 = 21158236133145 / (2 + 1 + 1 + 5 + 8 + 2 + 3 + 6 + 1 + 3 + 3 + 1 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 21158236133145.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235091512546 + ... + 235091512635.

It is an arithmetic number, because the mean of its divisors is an integer number (3056189663683).

Almost surely, 2^{21158236133145} is an apocalyptic number.

It is an amenable number.

21158236133145 is a deficient number, since it is larger than the sum of its proper divisors (15516039831051).

21158236133145 is a wasteful number, since it uses less digits than its factorization.

21158236133145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470183025192 (or 470183025189 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 21158236133145 in words is "twenty-one trillion, one hundred fifty-eight billion, two hundred thirty-six million, one hundred thirty-three thousand, one hundred forty-five".