21150205464311 has 16 divisors (see below), whose sum is σ = 26369429368320. Its totient is φ = 16480465810080.

The previous prime is 21150205464299. The next prime is 21150205464371. The reversal of 21150205464311 is 11346450205112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21150205464311 - 2¹⁸ = 21150205202167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150205464371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4328585 + ... + 7812621.

It is an arithmetic number, because the mean of its divisors is an integer number (1648089335520).

Almost surely, 2^{21150205464311} is an apocalyptic number.

21150205464311 is a deficient number, since it is larger than the sum of its proper divisors (5219223904009).

21150205464311 is a wasteful number, since it uses less digits than its factorization.

21150205464311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562894.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 21150205464311 its reverse (11346450205112), we get a palindrome (32496655669423).

The spelling of 21150205464311 in words is "twenty-one trillion, one hundred fifty billion, two hundred five million, four hundred sixty-four thousand, three hundred eleven".