21472450 has 12 divisors (see below), whose sum is σ = 39938850. Its totient is φ = 8588960.

The previous prime is 21472433. The next prime is 21472453. The reversal of 21472450 is 5427412.

It can be written as a sum of positive squares in 3 ways, for example, as 13126129 + 8346321 = 3623^2 + 2889^2 .

It is a super-2 number, since 2×21472450² = 922132218005000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21472453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214675 + ... + 214774.

Almost surely, 2^21472450 is an apocalyptic number.

21472450 is a deficient number, since it is larger than the sum of its proper divisors (18466400).

21472450 is a wasteful number, since it uses less digits than its factorization.

21472450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429461 (or 429456 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21472450 is about 4633.8375025458. The cubic root of 21472450 is about 277.9460672078.

Adding to 21472450 its reverse (5427412), we get a palindrome (26899862).

The spelling of 21472450 in words is "twenty-one million, four hundred seventy-two thousand, four hundred fifty".