21193056 has 96 divisors (see below), whose sum is σ = 65116800. Its totient is φ = 6687360.

The previous prime is 21193043. The next prime is 21193069. The reversal of 21193056 is 65039112.

It is an interprime number because it is at equal distance from previous prime (21193043) and next prime (21193069).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15771 + ... + 17061.

It is an arithmetic number, because the mean of its divisors is an integer number (678300).

Almost surely, 2^21193056 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 21193056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32558400).

21193056 is an abundant number, since it is smaller than the sum of its proper divisors (43923744).

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

21193056 is a wasteful number, since it uses less digits than its factorization.

21193056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1315 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 21193056 is about 4603.5916413166. The cubic root of 21193056 is about 276.7352795102.

The spelling of 21193056 in words is "twenty-one million, one hundred ninety-three thousand, fifty-six".