21582454072 has 8 divisors (see below), whose sum is σ = 40467101400. Its totient is φ = 10791227032.

The previous prime is 21582454001. The next prime is 21582454073. The reversal of 21582454072 is 27045428512.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21582454073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1348903372 + ... + 1348903387.

It is an arithmetic number, because the mean of its divisors is an integer number (5058387675).

Almost surely, 2^21582454072 is an apocalyptic number.

It is an amenable number.

21582454072 is a deficient number, since it is larger than the sum of its proper divisors (18884647328).

21582454072 is a wasteful number, since it uses less digits than its factorization.

21582454072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697806765 (or 2697806761 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 40.

The spelling of 21582454072 in words is "twenty-one billion, five hundred eighty-two million, four hundred fifty-four thousand, seventy-two".