21053450203 has 16 divisors (see below), whose sum is σ = 22162314240. Its totient is φ = 19979136576.

The previous prime is 21053450191. The next prime is 21053450237. The reversal of 21053450203 is 30205435012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21053450203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21053450603) 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, 238858 + ... + 314896.

It is an arithmetic number, because the mean of its divisors is an integer number (1385144640).

Almost surely, 2^21053450203 is an apocalyptic number.

21053450203 is a deficient number, since it is larger than the sum of its proper divisors (1108864037).

21053450203 is a wasteful number, since it uses less digits than its factorization.

21053450203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76266.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21053450203 its reverse (30205435012), we get a palindrome (51258885215).

The spelling of 21053450203 in words is "twenty-one billion, fifty-three million, four hundred fifty thousand, two hundred three".