21150216162325 has 12 divisors (see below), whose sum is σ = 26585531989348. Its totient is φ = 16688389737600.

The previous prime is 21150216162253. The next prime is 21150216162331. The reversal of 21150216162325 is 52326161205112.

It can be written as a sum of positive squares in 6 ways, for example, as 588770774596 + 20561445387729 = 767314^2 + 4534473^2 .

It is not a de Polignac number, because 21150216162325 - 2¹⁷ = 21150216031253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5794577946 + ... + 5794581595.

Almost surely, 2^{21150216162325} is an apocalyptic number.

21150216162325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21150216162325 is a deficient number, since it is larger than the sum of its proper divisors (5435315827023).

21150216162325 is a wasteful number, since it uses less digits than its factorization.

21150216162325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11589159624 (or 11589159619 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 21150216162325 its reverse (52326161205112), we get a palindrome (73476377367437).

The spelling of 21150216162325 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, one hundred sixty-two thousand, three hundred twenty-five".