5121213221 has 2 divisors, whose sum is σ = 5121213222. Its totient is φ = 5121213220.

The previous prime is 5121213217. The next prime is 5121213247. The reversal of 5121213221 is 1223121215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3830248321 + 1290964900 = 61889^2 + 35930^2 .

It is a cyclic number.

It is not a de Polignac number, because 5121213221 - 2² = 5121213217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5121213193 and 5121213202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5121213271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560606610 + 2560606611.

It is an arithmetic number, because the mean of its divisors is an integer number (2560606611).

Almost surely, 2^5121213221 is an apocalyptic number.

It is an amenable number.

5121213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121213221 is an equidigital number, since it uses as much as digits as its factorization.

5121213221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 20.

The square root of 5121213221 is about 71562.6524173049. The cubic root of 5121213221 is about 1723.6838769725.

Adding to 5121213221 its reverse (1223121215), we get a palindrome (6344334436).

The spelling of 5121213221 in words is "five billion, one hundred twenty-one million, two hundred thirteen thousand, two hundred twenty-one".