21200531153 has 4 divisors (see below), whose sum is σ = 21200912820. Its totient is φ = 21200149488.

The previous prime is 21200531141. The next prime is 21200531197. The reversal of 21200531153 is 35113500212.

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 8712915649 + 12487615504 = 93343^2 + 111748^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200531153 - 2⁴ = 21200531137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200831153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89618 + ... + 224571.

It is an arithmetic number, because the mean of its divisors is an integer number (5300228205).

Almost surely, 2^21200531153 is an apocalyptic number.

It is an amenable number.

21200531153 is a deficient number, since it is larger than the sum of its proper divisors (381667).

21200531153 is an equidigital number, since it uses as much as digits as its factorization.

21200531153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381666.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 21200531153 in words is "twenty-one billion, two hundred million, five hundred thirty-one thousand, one hundred fifty-three".