51021662 has 4 divisors (see below), whose sum is σ = 76532496. Its totient is φ = 25510830.

The previous prime is 51021637. The next prime is 51021667. The reversal of 51021662 is 26612015.

51021662 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26612015 = 5 ⋅5322403.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755414 + ... + 12755417.

It is an arithmetic number, because the mean of its divisors is an integer number (19133124).

Almost surely, 2^51021662 is an apocalyptic number.

51021662 is a deficient number, since it is larger than the sum of its proper divisors (25510834).

51021662 is a wasteful number, since it uses less digits than its factorization.

51021662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25510833.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51021662 is about 7142.9449108893. The cubic root of 51021662 is about 370.8954740735.

Adding to 51021662 its reverse (26612015), we get a palindrome (77633677).

The spelling of 51021662 in words is "fifty-one million, twenty-one thousand, six hundred sixty-two".