21303203140253 has 8 divisors (see below), whose sum is σ = 21321977314176. Its totient is φ = 21284429961600.

The previous prime is 21303203140231. The next prime is 21303203140277. The reversal of 21303203140253 is 35204130230312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21303203140253 - 2⁶ = 21303203140189 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 (21303203140853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46425500 + ... + 46882122.

It is an arithmetic number, because the mean of its divisors is an integer number (2665247164272).

Almost surely, 2^{21303203140253} is an apocalyptic number.

It is an amenable number.

21303203140253 is a deficient number, since it is larger than the sum of its proper divisors (18774173923).

21303203140253 is a wasteful number, since it uses less digits than its factorization.

21303203140253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497635.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 21303203140253 its reverse (35204130230312), we get a palindrome (56507333370565).

The spelling of 21303203140253 in words is "twenty-one trillion, three hundred three billion, two hundred three million, one hundred forty thousand, two hundred fifty-three".