21734351 has 6 divisors (see below), whose sum is σ = 22208880. Its totient is φ = 21269756.

The previous prime is 21734329. The next prime is 21734357. The reversal of 21734351 is 15343712.

It is a de Polignac number, because none of the positive numbers 2^k-21734351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21734351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734357) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2711 + ... + 7128.

It is an arithmetic number, because the mean of its divisors is an integer number (3701480).

Almost surely, 2^21734351 is an apocalyptic number.

21734351 is a deficient number, since it is larger than the sum of its proper divisors (474529).

21734351 is an frugal number, since it uses more digits than its factorization.

21734351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9933 (or 9886 counting only the distinct ones).

The product of its digits is 2520, while the sum is 26.

The square root of 21734351 is about 4662.0114757474. The cubic root of 21734351 is about 279.0715463365.

The spelling of 21734351 in words is "twenty-one million, seven hundred thirty-four thousand, three hundred fifty-one".