21734748 has 36 divisors (see below), whose sum is σ = 62790000. Its totient is φ = 6209856.

The previous prime is 21734731. The next prime is 21734749. The reversal of 21734748 is 84743712.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42873 + ... + 43376.

Almost surely, 2^21734748 is an apocalyptic number.

21734748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21734748 is an abundant number, since it is smaller than the sum of its proper divisors (41055252).

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

21734748 is a wasteful number, since it uses less digits than its factorization.

21734748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86266 (or 86261 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 21734748 is about 4662.0540537407. The cubic root of 21734748 is about 279.0732455012.

The spelling of 21734748 in words is "twenty-one million, seven hundred thirty-four thousand, seven hundred forty-eight".