21030968 has 16 divisors (see below), whose sum is σ = 45066480. Its totient is φ = 9013248.

The previous prime is 21030953. The next prime is 21030973. The reversal of 21030968 is 86903012.

It is a super-3 number, since 3×21030968³ (a number of 23 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 21030968.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187721 + ... + 187832.

It is an arithmetic number, because the mean of its divisors is an integer number (2816655).

Almost surely, 2^21030968 is an apocalyptic number.

21030968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21030968 is an abundant number, since it is smaller than the sum of its proper divisors (24035512).

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

21030968 is a wasteful number, since it uses less digits than its factorization.

21030968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375566 (or 375562 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21030968 is about 4585.9533360033. The cubic root of 21030968 is about 276.0279674803.

The spelling of 21030968 in words is "twenty-one million, thirty thousand, nine hundred sixty-eight".