21124530012072 has 64 divisors (see below), whose sum is σ = 53599017487680. Its totient is φ = 6936965015552.

The previous prime is 21124530012043. The next prime is 21124530012073. The reversal of 21124530012072 is 27021003542112.

It is not an unprimeable number, because it can be changed into a prime (21124530012073) 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, 14317623 + ... + 15723974.

It is an arithmetic number, because the mean of its divisors is an integer number (837484648245).

Almost surely, 2^{21124530012072} is an apocalyptic number.

It is an amenable number.

21124530012072 is an abundant number, since it is smaller than the sum of its proper divisors (32474487475608).

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

21124530012072 is a wasteful number, since it uses less digits than its factorization.

21124530012072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30042042 (or 30042038 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 21124530012072 its reverse (27021003542112), we get a palindrome (48145533554184).

The spelling of 21124530012072 in words is "twenty-one trillion, one hundred twenty-four billion, five hundred thirty million, twelve thousand, seventy-two".