21150216304324 has 6 divisors (see below), whose sum is σ = 37012878532574. Its totient is φ = 10575108152160.

The previous prime is 21150216304309. The next prime is 21150216304379. The reversal of 21150216304324 is 42340361205112.

It can be written as a sum of positive squares in only one way, i.e., 21068467201600 + 81749102724 = 4590040^2 + 285918^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21150216304324.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643777038037 + ... + 2643777038044.

Almost surely, 2^{21150216304324} is an apocalyptic number.

It is an amenable number.

21150216304324 is a deficient number, since it is larger than the sum of its proper divisors (15862662228250).

21150216304324 is a wasteful number, since it uses less digits than its factorization.

21150216304324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287554076085 (or 5287554076083 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21150216304324 its reverse (42340361205112), we get a palindrome (63490577509436).

The spelling of 21150216304324 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, three hundred four thousand, three hundred twenty-four".