21345523053 has 4 divisors (see below), whose sum is σ = 28460697408. Its totient is φ = 14230348700.

The previous prime is 21345523049. The next prime is 21345523057. The reversal of 21345523053 is 35032554312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21345523049) and next prime (21345523057).

It is a cyclic number.

It is not a de Polignac number, because 21345523053 - 2² = 21345523049 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345523057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3557587173 + ... + 3557587178.

It is an arithmetic number, because the mean of its divisors is an integer number (7115174352).

Almost surely, 2^21345523053 is an apocalyptic number.

It is an amenable number.

21345523053 is a deficient number, since it is larger than the sum of its proper divisors (7115174355).

21345523053 is an equidigital number, since it uses as much as digits as its factorization.

21345523053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115174354.

The product of its (nonzero) digits is 54000, while the sum is 33.

The spelling of 21345523053 in words is "twenty-one billion, three hundred forty-five million, five hundred twenty-three thousand, fifty-three".