21035726 has 4 divisors (see below), whose sum is σ = 31553592. Its totient is φ = 10517862.

The previous prime is 21035699. The next prime is 21035737. The reversal of 21035726 is 62753012.

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 = 21035695 and 21035704.

It is a congruent number.

It is an unprimeable number.

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, 5258930 + ... + 5258933.

It is an arithmetic number, because the mean of its divisors is an integer number (7888398).

Almost surely, 2^21035726 is an apocalyptic number.

21035726 is a deficient number, since it is larger than the sum of its proper divisors (10517866).

21035726 is a wasteful number, since it uses less digits than its factorization.

21035726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10517865.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21035726 is about 4586.4720646702. The cubic root of 21035726 is about 276.0487818977.

Adding to 21035726 its reverse (62753012), we get a palindrome (83788738).

It can be divided in two parts, 2103 and 5726, that multiplied together give a triangular number (12041778 = T₄₉₀₇).

The spelling of 21035726 in words is "twenty-one million, thirty-five thousand, seven hundred twenty-six".