21203204142311 has 4 divisors (see below), whose sum is σ = 21203266762152. Its totient is φ = 21203141522472.

The previous prime is 21203204142271. The next prime is 21203204142317. The reversal of 21203204142311 is 11324140230212.

It is a happy number.

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 21203204142311 - 2³⁰ = 21202130400487 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 (21203204142317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30799241 + ... + 31480146.

It is an arithmetic number, because the mean of its divisors is an integer number (5300816690538).

Almost surely, 2^{21203204142311} is an apocalyptic number.

21203204142311 is a deficient number, since it is larger than the sum of its proper divisors (62619841).

21203204142311 is an equidigital number, since it uses as much as digits as its factorization.

21203204142311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62619840.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21203204142311 its reverse (11324140230212), we get a palindrome (32527344372523).

The spelling of 21203204142311 in words is "twenty-one trillion, two hundred three billion, two hundred four million, one hundred forty-two thousand, three hundred eleven".