21365144156313 has 64 divisors (see below), whose sum is σ = 32961166560000. Its totient is φ = 13666416671232.

The previous prime is 21365144156309. The next prime is 21365144156329. The reversal of 21365144156313 is 31365144156312.

21365144156313 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 5 + 1 + 4 + 4 + 1 + 5 + 631 + 3 = 666.

It is not a de Polignac number, because 21365144156313 - 2² = 21365144156309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21365144156113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20173981 + ... + 21206597.

It is an arithmetic number, because the mean of its divisors is an integer number (515018227500).

Almost surely, 2^{21365144156313} is an apocalyptic number.

It is an amenable number.

21365144156313 is a deficient number, since it is larger than the sum of its proper divisors (11596022403687).

21365144156313 is a wasteful number, since it uses less digits than its factorization.

21365144156313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032951 (or 1032945 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

Subtracting 21365144156313 from its reverse (31365144156312), we obtain a palindrome (9999999999999).

The spelling of 21365144156313 in words is "twenty-one trillion, three hundred sixty-five billion, one hundred forty-four million, one hundred fifty-six thousand, three hundred thirteen".