21127260 has 192 divisors, whose sum is σ = 78382080. Its totient is φ = 4116480.

The previous prime is 21127247. The next prime is 21127273. The reversal of 21127260 is 6272112.

It is an interprime number because it is at equal distance from previous prime (21127247) and next prime (21127273).

It is a super-2 number, since 2×21127260² = 892722230215200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78406 + ... + 78674.

It is an arithmetic number, because the mean of its divisors is an integer number (408240).

Almost surely, 2^21127260 is an apocalyptic number.

21127260 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 21127260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39191040).

21127260 is an abundant number, since it is smaller than the sum of its proper divisors (57254820).

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

21127260 is a wasteful number, since it uses less digits than its factorization.

21127260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21127260 is about 4596.4399267259. The cubic root of 21127260 is about 276.4485983451.

Adding to 21127260 its reverse (6272112), we get a palindrome (27399372).

The spelling of 21127260 in words is "twenty-one million, one hundred twenty-seven thousand, two hundred sixty".