21146727 has 8 divisors (see below), whose sum is σ = 32223616. Its totient is φ = 12083832.

The previous prime is 21146717. The next prime is 21146747. The reversal of 21146727 is 72764112.

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

It is not a de Polignac number, because 21146727 - 2¹¹ = 21144679 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21146694 and 21146703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146717) 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, 503473 + ... + 503514.

It is an arithmetic number, because the mean of its divisors is an integer number (4027952).

Almost surely, 2^21146727 is an apocalyptic number.

21146727 is a deficient number, since it is larger than the sum of its proper divisors (11076889).

21146727 is a wasteful number, since it uses less digits than its factorization.

21146727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006997.

The product of its digits is 4704, while the sum is 30.

The square root of 21146727 is about 4598.5570562949. The cubic root of 21146727 is about 276.5334803538.

The spelling of 21146727 in words is "twenty-one million, one hundred forty-six thousand, seven hundred twenty-seven".