51321402 has 96 divisors (see below), whose sum is σ = 130740480. Its totient is φ = 14376960.

The previous prime is 51321401. The next prime is 51321421. The reversal of 51321402 is 20412315.

51321402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321401) 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 in 47 ways as a sum of consecutive naturals, for example, 265818 + ... + 266010.

It is an arithmetic number, because the mean of its divisors is an integer number (1361880).

Almost surely, 2^51321402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51321402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65370240).

51321402 is an abundant number, since it is smaller than the sum of its proper divisors (79419078).

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

51321402 is a wasteful number, since it uses less digits than its factorization.

51321402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51321402 is about 7163.8957278844. The cubic root of 51321402 is about 371.6203636562.

Adding to 51321402 its reverse (20412315), we get a palindrome (71733717).

The spelling of 51321402 in words is "fifty-one million, three hundred twenty-one thousand, four hundred two".