21059676 has 120 divisors (see below), whose sum is σ = 63423360. Its totient is φ = 6026400.

The previous prime is 21059671. The next prime is 21059677. The reversal of 21059676 is 67695012.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21059676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21059671) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 67561 + ... + 67871.

It is an arithmetic number, because the mean of its divisors is an integer number (528528).

Almost surely, 2^21059676 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 21059676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31711680).

21059676 is an abundant number, since it is smaller than the sum of its proper divisors (42363684).

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

21059676 is a wasteful number, since it uses less digits than its factorization.

21059676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 21059676 is about 4589.0822611934. The cubic root of 21059676 is about 276.1535062891.

It can be divided in two parts, 2105 and 9676, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 21059676 in words is "twenty-one million, fifty-nine thousand, six hundred seventy-six".