21535115530031 has 8 divisors (see below), whose sum is σ = 21664383502320. Its totient is φ = 21405947114368.

The previous prime is 21535115530003. The next prime is 21535115530043. The reversal of 21535115530031 is 13003551153512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21535115530031 is a prime.

It is a super-2 number, since 2×21535115530031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21535115529973 and 21535115530000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535115530051) 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 7 ways as a sum of consecutive naturals, for example, 24455216 + ... + 25320501.

It is an arithmetic number, because the mean of its divisors is an integer number (2708047937790).

Almost surely, 2^{21535115530031} is an apocalyptic number.

21535115530031 is a deficient number, since it is larger than the sum of its proper divisors (129267972289).

21535115530031 is a wasteful number, since it uses less digits than its factorization.

21535115530031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49778313.

The product of its (nonzero) digits is 33750, while the sum is 35.

Adding to 21535115530031 its reverse (13003551153512), we get a palindrome (34538666683543).

The spelling of 21535115530031 in words is "twenty-one trillion, five hundred thirty-five billion, one hundred fifteen million, five hundred thirty thousand, thirty-one".