51026021 has 8 divisors (see below), whose sum is σ = 51801600. Its totient is φ = 50253840.

The previous prime is 51025999. The next prime is 51026033. The reversal of 51026021 is 12062015.

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-51026021 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 (51026321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55556 + ... + 56466.

It is an arithmetic number, because the mean of its divisors is an integer number (6475200).

Almost surely, 2^51026021 is an apocalyptic number.

It is an amenable number.

51026021 is a deficient number, since it is larger than the sum of its proper divisors (775579).

51026021 is an equidigital number, since it uses as much as digits as its factorization.

51026021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51026021 is about 7143.2500306233. The cubic root of 51026021 is about 370.9060361712.

Adding to 51026021 its reverse (12062015), we get a palindrome (63088036).

The spelling of 51026021 in words is "fifty-one million, twenty-six thousand, twenty-one".