21472452 has 36 divisors (see below), whose sum is σ = 56290416. Its totient is φ = 7157160.

The previous prime is 21472433. The next prime is 21472453. The reversal of 21472452 is 25427412.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21472452² = 922132389784608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 11 ways as a sum of consecutive naturals, for example, 10074 + ... + 12017.

Almost surely, 2^21472452 is an apocalyptic number.

It is an amenable number.

21472452 is an abundant number, since it is smaller than the sum of its proper divisors (34817964).

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

21472452 is a wasteful number, since it uses less digits than its factorization.

21472452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22110 (or 22096 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 21472452 is about 4633.8377183497. The cubic root of 21472452 is about 277.9460758373.

Adding to 21472452 its reverse (25427412), we get a palindrome (46899864).

The spelling of 21472452 in words is "twenty-one million, four hundred seventy-two thousand, four hundred fifty-two".