21042829968 has 40 divisors (see below), whose sum is σ = 54397533216. Its totient is φ = 7009516800.

The previous prime is 21042829967. The next prime is 21042829979. The reversal of 21042829968 is 86992824012.

It is a super-3 number, since 3×21042829968³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21042829968.

It is not an unprimeable number, because it can be changed into a prime (21042829967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76918 + ... + 219093.

Almost surely, 2^21042829968 is an apocalyptic number.

It is an amenable number.

21042829968 is an abundant number, since it is smaller than the sum of its proper divisors (33354703248).

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

21042829968 is a wasteful number, since it uses less digits than its factorization.

21042829968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297503 (or 297497 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 21042829968 in words is "twenty-one billion, forty-two million, eight hundred twenty-nine thousand, nine hundred sixty-eight".