21321343142203 has 4 divisors (see below), whose sum is σ = 22961446460848. Its totient is φ = 19681239823560.

The previous prime is 21321343142167. The next prime is 21321343142213. The reversal of 21321343142203 is 30224134312312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321343142203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321343142213) 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, 820051659303 + ... + 820051659328.

It is an arithmetic number, because the mean of its divisors is an integer number (5740361615212).

Almost surely, 2^{21321343142203} is an apocalyptic number.

21321343142203 is a deficient number, since it is larger than the sum of its proper divisors (1640103318645).

21321343142203 is a wasteful number, since it uses less digits than its factorization.

21321343142203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640103318644.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21321343142203 its reverse (30224134312312), we get a palindrome (51545477454515).

The spelling of 21321343142203 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred forty-three million, one hundred forty-two thousand, two hundred three".