21465055436 has 12 divisors (see below), whose sum is σ = 40978742280. Its totient is φ = 9756843360.

The previous prime is 21465055427. The next prime is 21465055471. The reversal of 21465055436 is 63455056412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21465055393 and 21465055402.

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, 243921041 + ... + 243921128.

It is an arithmetic number, because the mean of its divisors is an integer number (3414895190).

Almost surely, 2^21465055436 is an apocalyptic number.

It is an amenable number.

21465055436 is a deficient number, since it is larger than the sum of its proper divisors (19513686844).

21465055436 is a wasteful number, since it uses less digits than its factorization.

21465055436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487842184 (or 487842182 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 21465055436 in words is "twenty-one billion, four hundred sixty-five million, fifty-five thousand, four hundred thirty-six".