21472365 has 8 divisors (see below), whose sum is σ = 34355808. Its totient is φ = 11451920.

The previous prime is 21472313. The next prime is 21472379. The reversal of 21472365 is 56327412.

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

It is not a de Polignac number, because 21472365 - 2¹⁰ = 21471341 is a prime.

It is a super-2 number, since 2×21472365² = 922124917386450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

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, 715731 + ... + 715760.

It is an arithmetic number, because the mean of its divisors is an integer number (4294476).

Almost surely, 2^21472365 is an apocalyptic number.

It is an amenable number.

21472365 is a deficient number, since it is larger than the sum of its proper divisors (12883443).

21472365 is a wasteful number, since it uses less digits than its factorization.

21472365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431499.

The product of its digits is 10080, while the sum is 30.

The square root of 21472365 is about 4633.8283308729. The cubic root of 21472365 is about 277.9457004518.

Adding to 21472365 its reverse (56327412), we get a palindrome (77799777).

The spelling of 21472365 in words is "twenty-one million, four hundred seventy-two thousand, three hundred sixty-five".