21153650726 has 8 divisors (see below), whose sum is σ = 34171281984. Its totient is φ = 9763223400.

The previous prime is 21153650723. The next prime is 21153650729. The reversal of 21153650726 is 62705635112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21153650723) and next prime (21153650729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21153650726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153650723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406800950 + ... + 406801001.

It is an arithmetic number, because the mean of its divisors is an integer number (4271410248).

Almost surely, 2^21153650726 is an apocalyptic number.

21153650726 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21153650726 is a deficient number, since it is larger than the sum of its proper divisors (13017631258).

21153650726 is a wasteful number, since it uses less digits than its factorization.

21153650726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813601966.

The product of its (nonzero) digits is 75600, while the sum is 38.

It can be divided in two parts, 211536 and 50726, that added together give a palindrome (262262).

The spelling of 21153650726 in words is "twenty-one billion, one hundred fifty-three million, six hundred fifty thousand, seven hundred twenty-six".