21441572 has 6 divisors (see below), whose sum is σ = 37522758. Its totient is φ = 10720784.

The previous prime is 21441569. The next prime is 21441577. The reversal of 21441572 is 27514412.

It can be written as a sum of positive squares in only one way, i.e., 19149376 + 2292196 = 4376^2 + 1514^2 .

It is not an unprimeable number, because it can be changed into a prime (21441577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680193 + ... + 2680200.

It is an arithmetic number, because the mean of its divisors is an integer number (6253793).

Almost surely, 2^21441572 is an apocalyptic number.

It is an amenable number.

21441572 is a deficient number, since it is larger than the sum of its proper divisors (16081186).

21441572 is a wasteful number, since it uses less digits than its factorization.

21441572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360397 (or 5360395 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 21441572 is about 4630.5045081503. The cubic root of 21441572 is about 277.8127718165.

Adding to 21441572 its reverse (27514412), we get a palindrome (48955984).

The spelling of 21441572 in words is "twenty-one million, four hundred forty-one thousand, five hundred seventy-two".