21472413 has 8 divisors (see below), whose sum is σ = 30136800. Its totient is φ = 13561488.

The previous prime is 21472403. The next prime is 21472417. The reversal of 21472413 is 31427412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21472413 - 2¹⁰ = 21471389 is a prime.

It is a super-2 number, since 2×21472413² = 922129040085138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188298 + ... + 188411.

It is an arithmetic number, because the mean of its divisors is an integer number (3767100).

Almost surely, 2^21472413 is an apocalyptic number.

It is an amenable number.

21472413 is a deficient number, since it is larger than the sum of its proper divisors (8664387).

21472413 is a wasteful number, since it uses less digits than its factorization.

21472413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376731.

The product of its digits is 1344, while the sum is 24.

The square root of 21472413 is about 4633.8335101728. The cubic root of 21472413 is about 277.9459075612.

Adding to 21472413 its reverse (31427412), we get a palindrome (52899825).

It can be divided in two parts, 2147 and 2413, that added together give a triangular number (4560 = T₉₅).

The spelling of 21472413 in words is "twenty-one million, four hundred seventy-two thousand, four hundred thirteen".