51413020020421 has 8 divisors (see below), whose sum is σ = 52805431349784. Its totient is φ = 50020759756800.

The previous prime is 51413020020403. The next prime is 51413020020433. The reversal of 51413020020421 is 12402002031415.

51413020020421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2997711332100 + 48415308688321 = 1731390^2 + 6958111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51413020020421 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 (51413020720421) 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, 37076380 + ... + 38438053.

It is an arithmetic number, because the mean of its divisors is an integer number (6600678918723).

Almost surely, 2^{51413020020421} is an apocalyptic number.

It is an amenable number.

51413020020421 is a deficient number, since it is larger than the sum of its proper divisors (1392411329363).

51413020020421 is a wasteful number, since it uses less digits than its factorization.

51413020020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75532871.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 51413020020421 its reverse (12402002031415), we get a palindrome (63815022051836).

The spelling of 51413020020421 in words is "fifty-one trillion, four hundred thirteen billion, twenty million, twenty thousand, four hundred twenty-one".