21653340531363 has 6 divisors (see below), whose sum is σ = 31277047434204. Its totient is φ = 14435560354236.

The previous prime is 21653340531313. The next prime is 21653340531391. The reversal of 21653340531363 is 36313504335612.

21653340531363 is a `hidden beast` number, since 2 + 1 + 6 + 53 + 3 + 4 + 0 + 531 + 3 + 63 = 666.

It is not a de Polignac number, because 21653340531363 - 2⁶ = 21653340531299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21653340531313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1202963362845 + ... + 1202963362862.

It is an arithmetic number, because the mean of its divisors is an integer number (5212841239034).

Almost surely, 2^{21653340531363} is an apocalyptic number.

21653340531363 is a deficient number, since it is larger than the sum of its proper divisors (9623706902841).

21653340531363 is a wasteful number, since it uses less digits than its factorization.

21653340531363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405926725713 (or 2405926725710 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 45.

Adding to 21653340531363 its reverse (36313504335612), we get a palindrome (57966844866975).

The spelling of 21653340531363 in words is "twenty-one trillion, six hundred fifty-three billion, three hundred forty million, five hundred thirty-one thousand, three hundred sixty-three".