21698160 has 80 divisors (see below), whose sum is σ = 73388160. Its totient is φ = 5259520.

The previous prime is 21698153. The next prime is 21698167. The reversal of 21698160 is 6189612.

It is an interprime number because it is at equal distance from previous prime (21698153) and next prime (21698167).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698167) 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 15 ways as a sum of consecutive naturals, for example, 1470 + ... + 6749.

It is an arithmetic number, because the mean of its divisors is an integer number (917352).

Almost surely, 2^21698160 is an apocalyptic number.

21698160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21698160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36694080).

21698160 is an abundant number, since it is smaller than the sum of its proper divisors (51690000).

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

21698160 is a wasteful number, since it uses less digits than its factorization.

21698160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8246 (or 8240 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 21698160 is about 4658.1283795104. The cubic root of 21698160 is about 278.9165614239.

The spelling of 21698160 in words is "twenty-one million, six hundred ninety-eight thousand, one hundred sixty".