21472851 has 8 divisors (see below), whose sum is σ = 28698624. Its totient is φ = 14281160.

The previous prime is 21472849. The next prime is 21472879. The reversal of 21472851 is 15827412.

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

It is a cyclic number.

It is not a de Polignac number, because 21472851 - 2¹ = 21472849 is a prime.

It is a super-2 number, since 2×21472851² = 922166660136402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472951) 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, 7011 + ... + 9596.

It is an arithmetic number, because the mean of its divisors is an integer number (3587328).

Almost surely, 2^21472851 is an apocalyptic number.

21472851 is a deficient number, since it is larger than the sum of its proper divisors (7225773).

21472851 is a wasteful number, since it uses less digits than its factorization.

21472851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17041.

The product of its digits is 4480, while the sum is 30.

The square root of 21472851 is about 4633.8807710169. The cubic root of 21472851 is about 277.9477974199.

The spelling of 21472851 in words is "twenty-one million, four hundred seventy-two thousand, eight hundred fifty-one".