21353301143 has 4 divisors (see below), whose sum is σ = 21874113408. Its totient is φ = 20832488880.

The previous prime is 21353301127. The next prime is 21353301209. The reversal of 21353301143 is 34110335312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21353301143 - 2⁴ = 21353301127 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 (21353301113) 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, 260406071 + ... + 260406152.

It is an arithmetic number, because the mean of its divisors is an integer number (5468528352).

Almost surely, 2^21353301143 is an apocalyptic number.

21353301143 is a deficient number, since it is larger than the sum of its proper divisors (520812265).

21353301143 is an equidigital number, since it uses as much as digits as its factorization.

21353301143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520812264.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21353301143 its reverse (34110335312), we get a palindrome (55463636455).

The spelling of 21353301143 in words is "twenty-one billion, three hundred fifty-three million, three hundred one thousand, one hundred forty-three".