21345727 has 8 divisors (see below), whose sum is σ = 24340176. Its totient is φ = 18544512.

The previous prime is 21345719. The next prime is 21345733. The reversal of 21345727 is 72754312.

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 21345727 - 2³ = 21345719 is a prime.

It is a super-2 number, since 2×21345727² = 911280122317058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345757) 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, 48073 + ... + 48514.

It is an arithmetic number, because the mean of its divisors is an integer number (3042522).

Almost surely, 2^21345727 is an apocalyptic number.

21345727 is a deficient number, since it is larger than the sum of its proper divisors (2994449).

21345727 is a wasteful number, since it uses less digits than its factorization.

21345727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96617.

The product of its digits is 11760, while the sum is 31.

The square root of 21345727 is about 4620.1436124865. The cubic root of 21345727 is about 277.3982073962.

The spelling of 21345727 in words is "twenty-one million, three hundred forty-five thousand, seven hundred twenty-seven".