21365034642133 has 16 divisors (see below), whose sum is σ = 26330818219776. Its totient is φ = 16881451896960.

The previous prime is 21365034642113. The next prime is 21365034642137. The reversal of 21365034642133 is 33124643056312.

It is a de Polignac number, because none of the positive numbers 2^k-21365034642133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21365034642133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365034642137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157927408 + ... + 158062633.

It is an arithmetic number, because the mean of its divisors is an integer number (1645676138736).

Almost surely, 2^{21365034642133} is an apocalyptic number.

It is an amenable number.

21365034642133 is a deficient number, since it is larger than the sum of its proper divisors (4965783577643).

21365034642133 is a wasteful number, since it uses less digits than its factorization.

21365034642133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315990804.

The product of its (nonzero) digits is 933120, while the sum is 43.

Adding to 21365034642133 its reverse (33124643056312), we get a palindrome (54489677698445).

The spelling of 21365034642133 in words is "twenty-one trillion, three hundred sixty-five billion, thirty-four million, six hundred forty-two thousand, one hundred thirty-three".