21202853 has 16 divisors (see below), whose sum is σ = 25190400. Its totient is φ = 17463600.

The previous prime is 21202847. The next prime is 21202861. The reversal of 21202853 is 35820212.

It is not a de Polignac number, because 21202853 - 2¹² = 21198757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42938 + ... + 43428.

It is an arithmetic number, because the mean of its divisors is an integer number (1574400).

Almost surely, 2^21202853 is an apocalyptic number.

It is an amenable number.

21202853 is a deficient number, since it is larger than the sum of its proper divisors (3987547).

21202853 is a wasteful number, since it uses less digits than its factorization.

21202853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21202853 is about 4604.6555788680. The cubic root of 21202853 is about 276.7779154546. Note that the first 3 decimals are identical.

The spelling of 21202853 in words is "twenty-one million, two hundred two thousand, eight hundred fifty-three".