21010608 has 60 divisors (see below), whose sum is σ = 59821320. Its totient is φ = 6882048.

The previous prime is 21010601. The next prime is 21010609. The reversal of 21010608 is 80601012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21010601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7260 + ... + 9732.

It is an arithmetic number, because the mean of its divisors is an integer number (997022).

Almost surely, 2^21010608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29910660).

21010608 is an abundant number, since it is smaller than the sum of its proper divisors (38810712).

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

21010608 is a wasteful number, since it uses less digits than its factorization.

21010608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546 (or 2537 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 21010608 is about 4583.7329765160. The cubic root of 21010608 is about 275.9388648462.

The spelling of 21010608 in words is "twenty-one million, ten thousand, six hundred eight".