21135041506252 has 48 divisors (see below), whose sum is σ = 37699632230400. Its totient is φ = 10365343770240.

The previous prime is 21135041506207. The next prime is 21135041506253. The reversal of 21135041506252 is 25260514053112.

It is not an unprimeable number, because it can be changed into a prime (21135041506253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210712249 + ... + 210812527.

It is an arithmetic number, because the mean of its divisors is an integer number (785409004800).

Almost surely, 2^{21135041506252} is an apocalyptic number.

It is an amenable number.

21135041506252 is a deficient number, since it is larger than the sum of its proper divisors (16564590724148).

21135041506252 is a wasteful number, since it uses less digits than its factorization.

21135041506252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104326 (or 104324 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 21135041506252 its reverse (25260514053112), we get a palindrome (46395555559364).

The spelling of 21135041506252 in words is "twenty-one trillion, one hundred thirty-five billion, forty-one million, five hundred six thousand, two hundred fifty-two".