21225734 has 32 divisors (see below), whose sum is σ = 34546176. Its totient is φ = 9757440.

The previous prime is 21225719. The next prime is 21225739. The reversal of 21225734 is 43752212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225739) 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, 218774 + ... + 218870.

It is an arithmetic number, because the mean of its divisors is an integer number (1079568).

Almost surely, 2^21225734 is an apocalyptic number.

21225734 is a deficient number, since it is larger than the sum of its proper divisors (13320442).

21225734 is a wasteful number, since it uses less digits than its factorization.

21225734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its digits is 3360, while the sum is 26.

The square root of 21225734 is about 4607.1394595779. The cubic root of 21225734 is about 276.8774410355.

Adding to 21225734 its reverse (43752212), we get a palindrome (64977946).

The spelling of 21225734 in words is "twenty-one million, two hundred twenty-five thousand, seven hundred thirty-four".