21394726 has 4 divisors (see below), whose sum is σ = 32092092. Its totient is φ = 10697362.

The previous prime is 21394697. The next prime is 21394733. The reversal of 21394726 is 62749312.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21394691 and 21394700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5348680 + ... + 5348683.

It is an arithmetic number, because the mean of its divisors is an integer number (8023023).

Almost surely, 2^21394726 is an apocalyptic number.

21394726 is a deficient number, since it is larger than the sum of its proper divisors (10697366).

21394726 is a wasteful number, since it uses less digits than its factorization.

21394726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10697365.

The product of its digits is 18144, while the sum is 34.

The square root of 21394726 is about 4625.4433301036. The cubic root of 21394726 is about 277.6103005504.

The spelling of 21394726 in words is "twenty-one million, three hundred ninety-four thousand, seven hundred twenty-six".