51273152111221 has 2 divisors, whose sum is σ = 51273152111222. Its totient is φ = 51273152111220.

The previous prime is 51273152111197. The next prime is 51273152111339. The reversal of 51273152111221 is 12211125137215.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45823612030596 + 5449540080625 = 6769314^2 + 2334425^2 .

It is a cyclic number.

It is not a de Polignac number, because 51273152111221 - 2¹⁵ = 51273152078453 is a prime.

It is a super-2 number, since 2×51273152111221² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51273152111821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25636576055610 + 25636576055611.

It is an arithmetic number, because the mean of its divisors is an integer number (25636576055611).

Almost surely, 2^{51273152111221} is an apocalyptic number.

It is an amenable number.

51273152111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51273152111221 is an equidigital number, since it uses as much as digits as its factorization.

51273152111221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 34.

Adding to 51273152111221 its reverse (12211125137215), we get a palindrome (63484277248436).

The spelling of 51273152111221 in words is "fifty-one trillion, two hundred seventy-three billion, one hundred fifty-two million, one hundred eleven thousand, two hundred twenty-one".