51540212203 has 2 divisors, whose sum is σ = 51540212204. Its totient is φ = 51540212202.

The previous prime is 51540212201. The next prime is 51540212219. The reversal of 51540212203 is 30221204515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51540212203 - 2¹ = 51540212201 is a prime.

It is a super-2 number, since 2×51540212203² (a number of 22 digits) contains 22 as substring.

Together with 51540212201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51540212201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25770106101 + 25770106102.

It is an arithmetic number, because the mean of its divisors is an integer number (25770106102).

Almost surely, 2^51540212203 is an apocalyptic number.

51540212203 is a deficient number, since it is larger than the sum of its proper divisors (1).

51540212203 is an equidigital number, since it uses as much as digits as its factorization.

51540212203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 51540212203 its reverse (30221204515), we get a palindrome (81761416718).

The spelling of 51540212203 in words is "fifty-one billion, five hundred forty million, two hundred twelve thousand, two hundred three".