5211561021253 has 2 divisors, whose sum is σ = 5211561021254. Its totient is φ = 5211561021252.

The previous prime is 5211561021239. The next prime is 5211561021269. The reversal of 5211561021253 is 3521201651125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3303731558689 + 1907829462564 = 1817617^2 + 1381242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5211561021253 is a prime.

It is a super-2 number, since 2×5211561021253² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5211561021853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605780510626 + 2605780510627.

It is an arithmetic number, because the mean of its divisors is an integer number (2605780510627).

Almost surely, 2^{5211561021253} is an apocalyptic number.

It is an amenable number.

5211561021253 is a deficient number, since it is larger than the sum of its proper divisors (1).

5211561021253 is an equidigital number, since it uses as much as digits as its factorization.

5211561021253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 5211561021253 its reverse (3521201651125), we get a palindrome (8732762672378).

The spelling of 5211561021253 in words is "five trillion, two hundred eleven billion, five hundred sixty-one million, twenty-one thousand, two hundred fifty-three".