51225013420 has 24 divisors (see below), whose sum is σ = 122940032544. Its totient is φ = 17562861696.

The previous prime is 51225013379. The next prime is 51225013421. The reversal of 51225013420 is 2431052215.

It is not an unprimeable number, because it can be changed into a prime (51225013421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182946337 + ... + 182946616.

It is an arithmetic number, because the mean of its divisors is an integer number (5122501356).

Almost surely, 2^51225013420 is an apocalyptic number.

It is an amenable number.

51225013420 is an abundant number, since it is smaller than the sum of its proper divisors (71715019124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51225013420 is a wasteful number, since it uses less digits than its factorization.

51225013420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365892969 (or 365892967 counting only the distinct ones).

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

Adding to 51225013420 its reverse (2431052215), we get a palindrome (53656065635).

The spelling of 51225013420 in words is "fifty-one billion, two hundred twenty-five million, thirteen thousand, four hundred twenty".