21521003454352 has 40 divisors (see below), whose sum is σ = 41713884515520. Its totient is φ = 10756130736000.

The previous prime is 21521003454347. The next prime is 21521003454371. The reversal of 21521003454352 is 25345430012512.

It is a happy number.

It is an unprimeable number.

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, 976485349 + ... + 976507387.

It is an arithmetic number, because the mean of its divisors is an integer number (1042847112888).

Almost surely, 2^{21521003454352} is an apocalyptic number.

It is an amenable number.

21521003454352 is a deficient number, since it is larger than the sum of its proper divisors (20192881061168).

21521003454352 is a wasteful number, since it uses less digits than its factorization.

21521003454352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44071 (or 44065 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21521003454352 its reverse (25345430012512), we get a palindrome (46866433466864).

The spelling of 21521003454352 in words is "twenty-one trillion, five hundred twenty-one billion, three million, four hundred fifty-four thousand, three hundred fifty-two".