51421000 has 32 divisors (see below), whose sum is σ = 120327480. Its totient is φ = 20568000.

The previous prime is 51420997. The next prime is 51421001. The reversal of 51421000 is 12415.

It can be written as a sum of positive squares in 4 ways, for example, as 17757796 + 33663204 = 4214^2 + 5802^2 .

It is not an unprimeable number, because it can be changed into a prime (51421001) 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, 24711 + ... + 26710.

Almost surely, 2^51421000 is an apocalyptic number.

51421000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51421000 is an abundant number, since it is smaller than the sum of its proper divisors (68906480).

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

51421000 is a wasteful number, since it uses less digits than its factorization.

51421000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51442 (or 51428 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 51421000 is about 7170.8437439398. The cubic root of 51421000 is about 371.8606060384.

Adding to 51421000 its reverse (12415), we get a palindrome (51433415).

The spelling of 51421000 in words is "fifty-one million, four hundred twenty-one thousand".