21426713 has 8 divisors (see below), whose sum is σ = 26713920. Its totient is φ = 16696080.

The previous prime is 21426709. The next prime is 21426719. The reversal of 21426713 is 31762412.

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 21426713 - 2² = 21426709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21426719) 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, 139058 + ... + 139211.

It is an arithmetic number, because the mean of its divisors is an integer number (3339240).

Almost surely, 2^21426713 is an apocalyptic number.

It is an amenable number.

21426713 is a deficient number, since it is larger than the sum of its proper divisors (5287207).

21426713 is a wasteful number, since it uses less digits than its factorization.

21426713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278287.

The product of its digits is 2016, while the sum is 26.

The square root of 21426713 is about 4628.8997612824. The cubic root of 21426713 is about 277.7485822767.

The spelling of 21426713 in words is "twenty-one million, four hundred twenty-six thousand, seven hundred thirteen".