21472853 has 4 divisors (see below), whose sum is σ = 22735980. Its totient is φ = 20209728.

The previous prime is 21472849. The next prime is 21472879. The reversal of 21472853 is 35827412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19562929 + 1909924 = 4423^2 + 1382^2 .

It is a cyclic number.

It is not a de Polignac number, because 21472853 - 2² = 21472849 is a prime.

It is a super-2 number, since 2×21472853² = 922166831919218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472813) 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 3 ways as a sum of consecutive naturals, for example, 631538 + ... + 631571.

It is an arithmetic number, because the mean of its divisors is an integer number (5683995).

Almost surely, 2^21472853 is an apocalyptic number.

It is an amenable number.

21472853 is a deficient number, since it is larger than the sum of its proper divisors (1263127).

21472853 is a wasteful number, since it uses less digits than its factorization.

21472853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263126.

The product of its digits is 13440, while the sum is 32.

The square root of 21472853 is about 4633.8809868187. The cubic root of 21472853 is about 277.9478060493.

The spelling of 21472853 in words is "twenty-one million, four hundred seventy-two thousand, eight hundred fifty-three".