51245354421 has 12 divisors (see below), whose sum is σ = 78375248172. Its totient is φ = 32153947776.

The previous prime is 51245354327. The next prime is 51245354429. The reversal of 51245354421 is 12445354215.

51245354421 is a `hidden beast` number, since 51 + 2 + 45 + 3 + 544 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 44358678225 + 6886676196 = 210615^2 + 82986^2 .

It is not a de Polignac number, because 51245354421 - 2¹⁴ = 51245338037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51245354429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167468326 + ... + 167468631.

It is an arithmetic number, because the mean of its divisors is an integer number (6531270681).

Almost surely, 2^51245354421 is an apocalyptic number.

51245354421 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51245354421 is a deficient number, since it is larger than the sum of its proper divisors (27129893751).

51245354421 is a wasteful number, since it uses less digits than its factorization.

51245354421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334936980 (or 334936977 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 51245354421 in words is "fifty-one billion, two hundred forty-five million, three hundred fifty-four thousand, four hundred twenty-one".