21114860 has 36 divisors (see below), whose sum is σ = 48022128. Its totient is φ = 7795008.

The previous prime is 21114853. The next prime is 21114869. The reversal of 21114860 is 6841112.

It is not an unprimeable number, because it can be changed into a prime (21114869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1333948).

Almost surely, 2^21114860 is an apocalyptic number.

21114860 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 21114860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24011064).

21114860 is an abundant number, since it is smaller than the sum of its proper divisors (26907268).

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

21114860 is a wasteful number, since it uses less digits than its factorization.

21114860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282 (or 6267 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21114860 is about 4595.0908587317. The cubic root of 21114860 is about 276.3945034067.

Adding to 21114860 its reverse (6841112), we get a palindrome (27955972).

The spelling of 21114860 in words is "twenty-one million, one hundred fourteen thousand, eight hundred sixty".