21119636 has 6 divisors (see below), whose sum is σ = 36959370. Its totient is φ = 10559816.

The previous prime is 21119629. The next prime is 21119639. The reversal of 21119636 is 63691112.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 6220036 = 3860^2 + 2494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21119599 and 21119608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639951 + ... + 2639958.

It is an arithmetic number, because the mean of its divisors is an integer number (6159895).

Almost surely, 2^21119636 is an apocalyptic number.

It is an amenable number.

21119636 is a deficient number, since it is larger than the sum of its proper divisors (15839734).

21119636 is a wasteful number, since it uses less digits than its factorization.

21119636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5279913 (or 5279911 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 21119636 is about 4595.6105143931. The cubic root of 21119636 is about 276.4153411900.

The spelling of 21119636 in words is "twenty-one million, one hundred nineteen thousand, six hundred thirty-six".