51421211 has 4 divisors (see below), whose sum is σ = 51690624. Its totient is φ = 51151800.

The previous prime is 51421193. The next prime is 51421213. The reversal of 51421211 is 11212415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51421211 - 2¹⁴ = 51404827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51421211.

It is not an unprimeable number, because it can be changed into a prime (51421213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134420 + ... + 134801.

It is an arithmetic number, because the mean of its divisors is an integer number (12922656).

Almost surely, 2^51421211 is an apocalyptic number.

51421211 is a deficient number, since it is larger than the sum of its proper divisors (269413).

51421211 is a wasteful number, since it uses less digits than its factorization.

51421211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269412.

The product of its digits is 80, while the sum is 17.

The square root of 51421211 is about 7170.8584562798. The cubic root of 51421211 is about 371.8611146664.

Adding to 51421211 its reverse (11212415), we get a palindrome (62633626).

The spelling of 51421211 in words is "fifty-one million, four hundred twenty-one thousand, two hundred eleven".