21472330 has 16 divisors (see below), whose sum is σ = 42164064. Its totient is φ = 7808080.

The previous prime is 21472313. The next prime is 21472379. The reversal of 21472330 is 3327412.

It is a super-2 number, since 2×21472330² = 922121911257800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 97492 + ... + 97711.

It is an arithmetic number, because the mean of its divisors is an integer number (2635254).

Almost surely, 2^21472330 is an apocalyptic number.

21472330 is a deficient number, since it is larger than the sum of its proper divisors (20691734).

21472330 is a wasteful number, since it uses less digits than its factorization.

21472330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195221.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21472330 is about 4633.8245542964. The cubic root of 21472330 is about 277.9455494344.

Adding to 21472330 its reverse (3327412), we get a palindrome (24799742).

The spelling of 21472330 in words is "twenty-one million, four hundred seventy-two thousand, three hundred thirty".