21150216162253 has 2 divisors, whose sum is σ = 21150216162254. Its totient is φ = 21150216162252.

The previous prime is 21150216162247. The next prime is 21150216162331. The reversal of 21150216162253 is 35226161205112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20094751702089 + 1055464460164 = 4482717^2 + 1027358^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150216162253 - 2¹³ = 21150216154061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150216162223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575108081126 + 10575108081127.

It is an arithmetic number, because the mean of its divisors is an integer number (10575108081127).

Almost surely, 2^{21150216162253} is an apocalyptic number.

It is an amenable number.

21150216162253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150216162253 is an equidigital number, since it uses as much as digits as its factorization.

21150216162253 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21150216162253 its reverse (35226161205112), we get a palindrome (56376377367365).

The spelling of 21150216162253 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, one hundred sixty-two thousand, two hundred fifty-three".