21325512424 has 8 divisors (see below), whose sum is σ = 39985335810. Its totient is φ = 10662756208.

The previous prime is 21325512389. The next prime is 21325512433. The reversal of 21325512424 is 42421552312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21289728100 + 35784324 = 145910^2 + 5982^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332844519 + ... + 1332844534.

Almost surely, 2^21325512424 is an apocalyptic number.

It is an amenable number.

21325512424 is a deficient number, since it is larger than the sum of its proper divisors (18659823386).

21325512424 is a wasteful number, since it uses less digits than its factorization.

21325512424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665689059 (or 2665689055 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The spelling of 21325512424 in words is "twenty-one billion, three hundred twenty-five million, five hundred twelve thousand, four hundred twenty-four".