21004462668 has 48 divisors (see below), whose sum is σ = 57314512640. Its totient is φ = 5861709504.

The previous prime is 21004462663. The next prime is 21004462669. The reversal of 21004462668 is 86626440012.

It is not an unprimeable number, because it can be changed into a prime (21004462663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2903983 + ... + 2911206.

Almost surely, 2^21004462668 is an apocalyptic number.

21004462668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21004462668 is an abundant number, since it is smaller than the sum of its proper divisors (36310049972).

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

21004462668 is a wasteful number, since it uses less digits than its factorization.

21004462668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5815246 (or 5815244 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 21004462668 in words is "twenty-one billion, four million, four hundred sixty-two thousand, six hundred sixty-eight".