21295726 has 4 divisors (see below), whose sum is σ = 31943592. Its totient is φ = 10647862.

The previous prime is 21295721. The next prime is 21295727. The reversal of 21295726 is 62759212.

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 = 21295691 and 21295700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21295721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5323930 + ... + 5323933.

It is an arithmetic number, because the mean of its divisors is an integer number (7985898).

Almost surely, 2^21295726 is an apocalyptic number.

21295726 is a deficient number, since it is larger than the sum of its proper divisors (10647866).

21295726 is a wasteful number, since it uses less digits than its factorization.

21295726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10647865.

The product of its digits is 15120, while the sum is 34.

The square root of 21295726 is about 4614.7292444953. The cubic root of 21295726 is about 277.1814422033.

The spelling of 21295726 in words is "twenty-one million, two hundred ninety-five thousand, seven hundred twenty-six".