21115530216452 has 12 divisors (see below), whose sum is σ = 42231060432960. Its totient is φ = 9049512949896.

The previous prime is 21115530216401. The next prime is 21115530216467. The reversal of 21115530216452 is 25461203551112.

21115530216452 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 377063039552 + ... + 377063039607.

It is an arithmetic number, because the mean of its divisors is an integer number (3519255036080).

Almost surely, 2^{21115530216452} is an apocalyptic number.

It is an amenable number.

21115530216452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21115530216452 is a wasteful number, since it uses less digits than its factorization.

21115530216452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754126079170 (or 754126079168 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 38.

Adding to 21115530216452 its reverse (25461203551112), we get a palindrome (46576733767564).

The spelling of 21115530216452 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, two hundred sixteen thousand, four hundred fifty-two".