21545226 has 24 divisors (see below), whose sum is σ = 46821060. Its totient is φ = 7160256.

The previous prime is 21545203. The next prime is 21545233. The reversal of 21545226 is 62254512.

It can be written as a sum of positive squares in 2 ways, for example, as 21483225 + 62001 = 4635^2 + 249^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21545226.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5110 + ... + 8318.

Almost surely, 2^21545226 is an apocalyptic number.

21545226 is an abundant number, since it is smaller than the sum of its proper divisors (25275834).

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

21545226 is a wasteful number, since it uses less digits than its factorization.

21545226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590 (or 3587 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 21545226 is about 4641.6835307892. The cubic root of 21545226 is about 278.2597248389.

Adding to 21545226 its reverse (62254512), we get a palindrome (83799738).

The spelling of 21545226 in words is "twenty-one million, five hundred forty-five thousand, two hundred twenty-six".