51225212213 has 4 divisors (see below), whose sum is σ = 58543099680. Its totient is φ = 43907324748.

The previous prime is 51225212191. The next prime is 51225212303. The reversal of 51225212213 is 31221252215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31221252215 = 5 ⋅6244250443.

It is not a de Polignac number, because 51225212213 - 2¹⁴ = 51225195829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51225212113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3658943723 + ... + 3658943736.

It is an arithmetic number, because the mean of its divisors is an integer number (14635774920).

Almost surely, 2^51225212213 is an apocalyptic number.

It is an amenable number.

51225212213 is a deficient number, since it is larger than the sum of its proper divisors (7317887467).

51225212213 is an equidigital number, since it uses as much as digits as its factorization.

51225212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317887466.

The product of its digits is 2400, while the sum is 26.

Adding to 51225212213 its reverse (31221252215), we get a palindrome (82446464428).

The spelling of 51225212213 in words is "fifty-one billion, two hundred twenty-five million, two hundred twelve thousand, two hundred thirteen".