21373530534252 has 144 divisors (see below), whose sum is σ = 58295967428608. Its totient is φ = 6563770899840.

The previous prime is 21373530534197. The next prime is 21373530534253. The reversal of 21373530534252 is 25243503537312.

21373530534252 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 35 + 30 + 534 + 2 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21373530534198 and 21373530534207.

It is not an unprimeable number, because it can be changed into a prime (21373530534253) 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 47 ways as a sum of consecutive naturals, for example, 533477973 + ... + 533518035.

Almost surely, 2^{21373530534252} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21373530534252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29147983714304).

21373530534252 is an abundant number, since it is smaller than the sum of its proper divisors (36922436894356).

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

21373530534252 is a wasteful number, since it uses less digits than its factorization.

21373530534252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42260 (or 42255 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 45.

The spelling of 21373530534252 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred thirty million, five hundred thirty-four thousand, two hundred fifty-two".