51054652421 has 4 divisors (see below), whose sum is σ = 51057775692. Its totient is φ = 51051529152.

The previous prime is 51054652393. The next prime is 51054652423. The reversal of 51054652421 is 12425645015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37941196225 + 13113456196 = 194785^2 + 114514^2 .

It is a cyclic number.

It is not a de Polignac number, because 51054652421 - 2¹⁴ = 51054636037 is a prime.

It is a super-2 number, since 2×51054652421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51054652423) 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, 1536986 + ... + 1569851.

It is an arithmetic number, because the mean of its divisors is an integer number (12764443923).

Almost surely, 2^51054652421 is an apocalyptic number.

It is an amenable number.

51054652421 is a deficient number, since it is larger than the sum of its proper divisors (3123271).

51054652421 is a wasteful number, since it uses less digits than its factorization.

51054652421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123270.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 51054652421 in words is "fifty-one billion, fifty-four million, six hundred fifty-two thousand, four hundred twenty-one".