21534335255340 has 48 divisors (see below), whose sum is σ = 66995709684960. Its totient is φ = 5742489401280.

The previous prime is 21534335255297. The next prime is 21534335255347. The reversal of 21534335255340 is 4355253343512.

21534335255340 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 4 + 3 + 3 + 52 + 553 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21534335255347) 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, 19939198771 + ... + 19939199850.

It is an arithmetic number, because the mean of its divisors is an integer number (1395743951770).

Almost surely, 2^{21534335255340} is an apocalyptic number.

21534335255340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21534335255340 is an abundant number, since it is smaller than the sum of its proper divisors (45461374429620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21534335255340 is a wasteful number, since it uses less digits than its factorization.

21534335255340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39878398639 (or 39878398631 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 45.

Adding to 21534335255340 its reverse (4355253343512), we get a palindrome (25889588598852).

The spelling of 21534335255340 in words is "twenty-one trillion, five hundred thirty-four billion, three hundred thirty-five million, two hundred fifty-five thousand, three hundred forty".