21513441453252 has 48 divisors (see below), whose sum is σ = 58451614526592. Its totient is φ = 6030722131200.

The previous prime is 21513441453247. The next prime is 21513441453269. The reversal of 21513441453252 is 25235414431512.

It is a super-3 number, since 3×21513441453252³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2416150249 + ... + 2416159152.

It is an arithmetic number, because the mean of its divisors is an integer number (1217741969304).

Almost surely, 2^{21513441453252} is an apocalyptic number.

It is an amenable number.

21513441453252 is an abundant number, since it is smaller than the sum of its proper divisors (36938173073340).

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

21513441453252 is a wasteful number, since it uses less digits than its factorization.

21513441453252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832309468 (or 4832309466 counting only the distinct ones).

The product of its digits is 576000, while the sum is 42.

Adding to 21513441453252 its reverse (25235414431512), we get a palindrome (46748855884764).

The spelling of 21513441453252 in words is "twenty-one trillion, five hundred thirteen billion, four hundred forty-one million, four hundred fifty-three thousand, two hundred fifty-two".