51021402 has 16 divisors (see below), whose sum is σ = 102114432. Its totient is φ = 16995200.

The previous prime is 51021401. The next prime is 51021413. The reversal of 51021402 is 20412015.

It is not an unprimeable number, because it can be changed into a prime (51021401) 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, 12298 + ... + 15914.

It is an arithmetic number, because the mean of its divisors is an integer number (6382152).

Almost surely, 2^51021402 is an apocalyptic number.

51021402 is an abundant number, since it is smaller than the sum of its proper divisors (51093030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51021402 is a wasteful number, since it uses less digits than its factorization.

51021402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5973.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51021402 is about 7142.9267110898. The cubic root of 51021402 is about 370.8948440602.

Adding to 51021402 its reverse (20412015), we get a palindrome (71433417).

It can be divided in two parts, 510 and 21402, that added together give a palindrome (21912).

The spelling of 51021402 in words is "fifty-one million, twenty-one thousand, four hundred two".