51530122021 has 16 divisors (see below), whose sum is σ = 59257473408. Its totient is φ = 43894468800.

The previous prime is 51530122013. The next prime is 51530122051. The reversal of 51530122021 is 12022103515.

It is not a de Polignac number, because 51530122021 - 2³ = 51530122013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51530121983 and 51530122001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530122051) 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 15 ways as a sum of consecutive naturals, for example, 3299451 + ... + 3315031.

It is an arithmetic number, because the mean of its divisors is an integer number (3703592088).

Almost surely, 2^51530122021 is an apocalyptic number.

It is an amenable number.

51530122021 is a deficient number, since it is larger than the sum of its proper divisors (7727351387).

51530122021 is a wasteful number, since it uses less digits than its factorization.

51530122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18492.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 51530122021 its reverse (12022103515), we get a palindrome (63552225536).

The spelling of 51530122021 in words is "fifty-one billion, five hundred thirty million, one hundred twenty-two thousand, twenty-one".