21960008 has 16 divisors (see below), whose sum is σ = 47057280. Its totient is φ = 9411408.

The previous prime is 21960007. The next prime is 21960011. The reversal of 21960008 is 80006912.

It is not an unprimeable number, because it can be changed into a prime (21960007) 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 3 ways as a sum of consecutive naturals, for example, 196016 + ... + 196127.

It is an arithmetic number, because the mean of its divisors is an integer number (2941080).

Almost surely, 2^21960008 is an apocalyptic number.

21960008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21960008 is an abundant number, since it is smaller than the sum of its proper divisors (25097272).

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

21960008 is a wasteful number, since it uses less digits than its factorization.

21960008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392156 (or 392152 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21960008 is about 4686.1506591231. The cubic root of 21960008 is about 280.0340434797.

The spelling of 21960008 in words is "twenty-one million, nine hundred sixty thousand, eight".