21200153 has 4 divisors (see below), whose sum is σ = 22830948. Its totient is φ = 19569360.

The previous prime is 21200147. The next prime is 21200171. The reversal of 21200153 is 35100212.

It is a happy number.

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 2778889 + 18421264 = 1667^2 + 4292^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200153 - 2⁸ = 21199897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203153) 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, 815378 + ... + 815403.

It is an arithmetic number, because the mean of its divisors is an integer number (5707737).

Almost surely, 2^21200153 is an apocalyptic number.

It is an amenable number.

21200153 is a deficient number, since it is larger than the sum of its proper divisors (1630795).

21200153 is a wasteful number, since it uses less digits than its factorization.

21200153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630794.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21200153 is about 4604.3623879968. The cubic root of 21200153 is about 276.7661665311.

Adding to 21200153 its reverse (35100212), we get a palindrome (56300365).

The spelling of 21200153 in words is "twenty-one million, two hundred thousand, one hundred fifty-three".