21534011341355 has 16 divisors (see below), whose sum is σ = 25949732305728. Its totient is φ = 17154605952000.

The previous prime is 21534011341319. The next prime is 21534011341357. The reversal of 21534011341355 is 55314311043512.

It is not a de Polignac number, because 21534011341355 - 2¹⁴ = 21534011324971 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21534011341357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18114695 + ... + 19266815.

It is an arithmetic number, because the mean of its divisors is an integer number (1621858269108).

Almost surely, 2^{21534011341355} is an apocalyptic number.

21534011341355 is a deficient number, since it is larger than the sum of its proper divisors (4415720964373).

21534011341355 is a wasteful number, since it uses less digits than its factorization.

21534011341355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167878.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 21534011341355 its reverse (55314311043512), we get a palindrome (76848322384867).

The spelling of 21534011341355 in words is "twenty-one trillion, five hundred thirty-four billion, eleven million, three hundred forty-one thousand, three hundred fifty-five".