21110036 has 6 divisors (see below), whose sum is σ = 36942570. Its totient is φ = 10555016.

The previous prime is 21110029. The next prime is 21110041. The reversal of 21110036 is 63001112.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 498436 = 4540^2 + 706^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21110036.

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, 2638751 + ... + 2638758.

It is an arithmetic number, because the mean of its divisors is an integer number (6157095).

Almost surely, 2^21110036 is an apocalyptic number.

It is an amenable number.

21110036 is a deficient number, since it is larger than the sum of its proper divisors (15832534).

21110036 is a wasteful number, since it uses less digits than its factorization.

21110036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277513 (or 5277511 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21110036 is about 4594.5659207372. The cubic root of 21110036 is about 276.3734530085.

Adding to 21110036 its reverse (63001112), we get a palindrome (84111148).

The spelling of 21110036 in words is "twenty-one million, one hundred ten thousand, thirty-six".