21295968 has 48 divisors (see below), whose sum is σ = 59194800. Its totient is φ = 6680576.

The previous prime is 21295961. The next prime is 21295997. The reversal of 21295968 is 86959212.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21295961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4893 + ... + 8156.

It is an arithmetic number, because the mean of its divisors is an integer number (1233225).

Almost surely, 2^21295968 is an apocalyptic number.

It is an amenable number.

21295968 is an abundant number, since it is smaller than the sum of its proper divisors (37898832).

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

21295968 is a wasteful number, since it uses less digits than its factorization.

21295968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13079 (or 13071 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 21295968 is about 4614.7554648107. The cubic root of 21295968 is about 277.1824921425.

The spelling of 21295968 in words is "twenty-one million, two hundred ninety-five thousand, nine hundred sixty-eight".