51033140021 has 16 divisors (see below), whose sum is σ = 55909440000. Its totient is φ = 46365758208.

The previous prime is 51033140017. The next prime is 51033140023. The reversal of 51033140021 is 12004133015.

It is a cyclic number.

It is not a de Polignac number, because 51033140021 - 2² = 51033140017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51033139975 and 51033140002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51033140023) 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, 4430756 + ... + 4442258.

It is an arithmetic number, because the mean of its divisors is an integer number (3494340000).

Almost surely, 2^51033140021 is an apocalyptic number.

It is an amenable number.

51033140021 is a deficient number, since it is larger than the sum of its proper divisors (4876299979).

51033140021 is a wasteful number, since it uses less digits than its factorization.

51033140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20548.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 51033140021 its reverse (12004133015), we get a palindrome (63037273036).

The spelling of 51033140021 in words is "fifty-one billion, thirty-three million, one hundred forty thousand, twenty-one".