21154300253 has 16 divisors (see below), whose sum is σ = 21771520320. Its totient is φ = 20543048064.

The previous prime is 21154300213. The next prime is 21154300283. The reversal of 21154300253 is 35200345112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21154300253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154300213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11057225 + ... + 11059137.

It is an arithmetic number, because the mean of its divisors is an integer number (1360720020).

Almost surely, 2^21154300253 is an apocalyptic number.

It is an amenable number.

21154300253 is a deficient number, since it is larger than the sum of its proper divisors (617220067).

21154300253 is a wasteful number, since it uses less digits than its factorization.

21154300253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21154300253 its reverse (35200345112), we get a palindrome (56354645365).

The spelling of 21154300253 in words is "twenty-one billion, one hundred fifty-four million, three hundred thousand, two hundred fifty-three".