21734751 has 16 divisors (see below), whose sum is σ = 30218240. Its totient is φ = 13880160.

The previous prime is 21734749. The next prime is 21734753. The reversal of 21734751 is 15743712.

It is an interprime number because it is at equal distance from previous prime (21734749) and next prime (21734753).

It is not a de Polignac number, because 21734751 - 2¹ = 21734749 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8445 + ... + 10713.

It is an arithmetic number, because the mean of its divisors is an integer number (1888640).

Almost surely, 2^21734751 is an apocalyptic number.

21734751 is a deficient number, since it is larger than the sum of its proper divisors (8483489).

21734751 is a wasteful number, since it uses less digits than its factorization.

21734751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406.

The product of its digits is 5880, while the sum is 30.

The square root of 21734751 is about 4662.0543754873. The cubic root of 21734751 is about 279.0732583412.

The spelling of 21734751 in words is "twenty-one million, seven hundred thirty-four thousand, seven hundred fifty-one".