21036788 has 12 divisors (see below), whose sum is σ = 37105152. Its totient is φ = 10435320.

The previous prime is 21036787. The next prime is 21036791. The reversal of 21036788 is 88763012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20198 + ... + 21213.

It is an arithmetic number, because the mean of its divisors is an integer number (3092096).

Almost surely, 2^21036788 is an apocalyptic number.

It is an amenable number.

21036788 is a deficient number, since it is larger than the sum of its proper divisors (16068364).

21036788 is a wasteful number, since it uses less digits than its factorization.

21036788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41542 (or 41540 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21036788 is about 4586.5878384699. The cubic root of 21036788 is about 276.0534273102.

The spelling of 21036788 in words is "twenty-one million, thirty-six thousand, seven hundred eighty-eight".