21351531303411 has 4 divisors (see below), whose sum is σ = 28468708404552. Its totient is φ = 14234354202272.

The previous prime is 21351531303407. The next prime is 21351531303433. The reversal of 21351531303411 is 11430313515312.

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 21351531303411 - 2² = 21351531303407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21351531303211) 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, 3558588550566 + ... + 3558588550571.

It is an arithmetic number, because the mean of its divisors is an integer number (7117177101138).

Almost surely, 2^{21351531303411} is an apocalyptic number.

21351531303411 is a deficient number, since it is larger than the sum of its proper divisors (7117177101141).

21351531303411 is an equidigital number, since it uses as much as digits as its factorization.

21351531303411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117177101140.

The product of its (nonzero) digits is 16200, while the sum is 33.

Adding to 21351531303411 its reverse (11430313515312), we get a palindrome (32781844818723).

The spelling of 21351531303411 in words is "twenty-one trillion, three hundred fifty-one billion, five hundred thirty-one million, three hundred three thousand, four hundred eleven".