21531535254234 has 48 divisors (see below), whose sum is σ = 46863385920000. Its totient is φ = 7144648806048.

The previous prime is 21531535254233. The next prime is 21531535254247. The reversal of 21531535254234 is 43245253513512.

21531535254234 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 1 + 53 + 52 + 542 + 3 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21531535254234.

It is not an unprimeable number, because it can be changed into a prime (21531535254233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4103767 + ... + 7739765.

It is an arithmetic number, because the mean of its divisors is an integer number (976320540000).

Almost surely, 2^{21531535254234} is an apocalyptic number.

21531535254234 is an abundant number, since it is smaller than the sum of its proper divisors (25331850665766).

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

21531535254234 is a wasteful number, since it uses less digits than its factorization.

21531535254234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637499 (or 3637496 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 45.

Adding to 21531535254234 its reverse (43245253513512), we get a palindrome (64776788767746).

The spelling of 21531535254234 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred thirty-five million, two hundred fifty-four thousand, two hundred thirty-four".