21514150145 has 4 divisors (see below), whose sum is σ = 25816980180. Its totient is φ = 17211320112.

The previous prime is 21514150111. The next prime is 21514150169. The reversal of 21514150145 is 54105141512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2692779664 + 18821370481 = 51892^2 + 137191^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514150145 - 2¹⁰ = 21514149121 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151415010 + ... + 2151415019.

It is an arithmetic number, because the mean of its divisors is an integer number (6454245045).

Almost surely, 2^21514150145 is an apocalyptic number.

It is an amenable number.

21514150145 is a deficient number, since it is larger than the sum of its proper divisors (4302830035).

21514150145 is an equidigital number, since it uses as much as digits as its factorization.

21514150145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302830034.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 21514150145 its reverse (54105141512), we get a palindrome (75619291657).

The spelling of 21514150145 in words is "twenty-one billion, five hundred fourteen million, one hundred fifty thousand, one hundred forty-five".