21282861 has 8 divisors (see below), whose sum is σ = 30046464. Its totient is φ = 13353920.

The previous prime is 21282857. The next prime is 21282871. The reversal of 21282861 is 16828212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21282861 - 2² = 21282857 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208605 + ... + 208706.

It is an arithmetic number, because the mean of its divisors is an integer number (3755808).

Almost surely, 2^21282861 is an apocalyptic number.

It is an amenable number.

21282861 is a deficient number, since it is larger than the sum of its proper divisors (8763603).

21282861 is a wasteful number, since it uses less digits than its factorization.

21282861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417331.

The product of its digits is 3072, while the sum is 30.

The square root of 21282861 is about 4613.3351276490. The cubic root of 21282861 is about 277.1256147637.

The spelling of 21282861 in words is "twenty-one million, two hundred eighty-two thousand, eight hundred sixty-one".