21225074 has 16 divisors (see below), whose sum is σ = 34365912. Its totient is φ = 9773568.

The previous prime is 21225047. The next prime is 21225077. The reversal of 21225074 is 47052212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6838225 + 14386849 = 2615^2 + 3793^2 .

It is not an unprimeable number, because it can be changed into a prime (21225077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16892 + ... + 18104.

Almost surely, 2^21225074 is an apocalyptic number.

21225074 is a deficient number, since it is larger than the sum of its proper divisors (13140838).

21225074 is a wasteful number, since it uses less digits than its factorization.

21225074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21225074 is about 4607.0678310613. The cubic root of 21225074 is about 276.8745712328.

Adding to 21225074 its reverse (47052212), we get a palindrome (68277286).

The spelling of 21225074 in words is "twenty-one million, two hundred twenty-five thousand, seventy-four".