21213030113161 has 2 divisors, whose sum is σ = 21213030113162. Its totient is φ = 21213030113160.

The previous prime is 21213030113137. The next prime is 21213030113227. The reversal of 21213030113161 is 16131103031212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15218152092025 + 5994878021136 = 3901045^2 + 2448444^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213030113161 - 2²⁹ = 21212493242249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213030113761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606515056580 + 10606515056581.

It is an arithmetic number, because the mean of its divisors is an integer number (10606515056581).

Almost surely, 2^{21213030113161} is an apocalyptic number.

It is an amenable number.

21213030113161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213030113161 is an equidigital number, since it uses as much as digits as its factorization.

21213030113161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

Adding to 21213030113161 its reverse (16131103031212), we get a palindrome (37344133144373).

The spelling of 21213030113161 in words is "twenty-one trillion, two hundred thirteen billion, thirty million, one hundred thirteen thousand, one hundred sixty-one".