21734736 has 20 divisors (see below), whose sum is σ = 56148192. Its totient is φ = 7244896.

The previous prime is 21734731. The next prime is 21734749. The reversal of 21734736 is 63743712.

It is a junction number, because it is equal to n+sod(n) for n = 21734697 and 21734706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226356 + ... + 226451.

Almost surely, 2^21734736 is an apocalyptic number.

It is an amenable number.

21734736 is an abundant number, since it is smaller than the sum of its proper divisors (34413456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21734736 is a wasteful number, since it uses less digits than its factorization.

21734736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452818 (or 452812 counting only the distinct ones).

The product of its digits is 21168, while the sum is 33.

The square root of 21734736 is about 4662.0527667541. The cubic root of 21734736 is about 279.0731941414.

The spelling of 21734736 in words is "twenty-one million, seven hundred thirty-four thousand, seven hundred thirty-six".