51021542 has 16 divisors (see below), whose sum is σ = 89912592. Its totient is φ = 21407520.

The previous prime is 51021533. The next prime is 51021569. The reversal of 51021542 is 24512015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88913 + ... + 89484.

It is an arithmetic number, because the mean of its divisors is an integer number (5619537).

Almost surely, 2^51021542 is an apocalyptic number.

51021542 is a deficient number, since it is larger than the sum of its proper divisors (38891050).

51021542 is a wasteful number, since it uses less digits than its factorization.

51021542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178423.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51021542 is about 7142.9365109876. The cubic root of 51021542 is about 370.8951832984.

Adding to 51021542 its reverse (24512015), we get a palindrome (75533557).

The spelling of 51021542 in words is "fifty-one million, twenty-one thousand, five hundred forty-two".