21462217648 has 20 divisors (see below), whose sum is σ = 41628921640. Its totient is φ = 10719270144.

The previous prime is 21462217633. The next prime is 21462217649. The reversal of 21462217648 is 84671226412.

It is not an unprimeable number, because it can be changed into a prime (21462217649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724953 + ... + 753976.

It is an arithmetic number, because the mean of its divisors is an integer number (2081446082).

Almost surely, 2^21462217648 is an apocalyptic number.

It is an amenable number.

21462217648 is a deficient number, since it is larger than the sum of its proper divisors (20166703992).

21462217648 is a wasteful number, since it uses less digits than its factorization.

21462217648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479844 (or 1479838 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The spelling of 21462217648 in words is "twenty-one billion, four hundred sixty-two million, two hundred seventeen thousand, six hundred forty-eight".