21059104 has 48 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 9237760.

The previous prime is 21059089. The next prime is 21059119. The reversal of 21059104 is 40195012.

21059104 = T₁₉₂ + T₁₉₃ + ... + T₅₁₀.

It is an interprime number because it is at equal distance from previous prime (21059089) and next prime (21059119).

It is a super-2 number, since 2×21059104² = 886971722565632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9177 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (975240).

Almost surely, 2^21059104 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 21059104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23405760).

21059104 is an abundant number, since it is smaller than the sum of its proper divisors (25752416).

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

21059104 is a wasteful number, since it uses less digits than its factorization.

21059104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113 (or 2105 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21059104 is about 4589.0199389412. The cubic root of 21059104 is about 276.1510060728.

The spelling of 21059104 in words is "twenty-one million, fifty-nine thousand, one hundred four".