21110050314521 has 4 divisors (see below), whose sum is σ = 24125771788032. Its totient is φ = 18094328841012.

The previous prime is 21110050314491. The next prime is 21110050314583. The reversal of 21110050314521 is 12541305001112.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110050314521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110050316521) 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, 1507860736745 + ... + 1507860736758.

It is an arithmetic number, because the mean of its divisors is an integer number (6031442947008).

Almost surely, 2^{21110050314521} is an apocalyptic number.

It is an amenable number.

21110050314521 is a deficient number, since it is larger than the sum of its proper divisors (3015721473511).

21110050314521 is an equidigital number, since it uses as much as digits as its factorization.

21110050314521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015721473510.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21110050314521 its reverse (12541305001112), we get a palindrome (33651355315633).

The spelling of 21110050314521 in words is "twenty-one trillion, one hundred ten billion, fifty million, three hundred fourteen thousand, five hundred twenty-one".