21095460 has 72 divisors (see below), whose sum is σ = 64471680. Its totient is φ = 5583168.

The previous prime is 21095429. The next prime is 21095461. The reversal of 21095460 is 6459012.

It is a super-2 number, since 2×21095460² = 890036865223200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21095461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28981 + ... + 29699.

It is an arithmetic number, because the mean of its divisors is an integer number (895440).

Almost surely, 2^21095460 is an apocalyptic number.

21095460 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 21095460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32235840).

21095460 is an abundant number, since it is smaller than the sum of its proper divisors (43376220).

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

21095460 is a wasteful number, since it uses less digits than its factorization.

21095460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21095460 is about 4592.9794251662. The cubic root of 21095460 is about 276.3098285001.

It can be divided in two parts, 2109 and 5460, that added together give a square (7569 = 87²).

The spelling of 21095460 in words is "twenty-one million, ninety-five thousand, four hundred sixty".