51221323210 has 16 divisors (see below), whose sum is σ = 92248989696. Its totient is φ = 20477283088.

The previous prime is 51221323183. The next prime is 51221323243. The reversal of 51221323210 is 1232312215.

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, 1386634 + ... + 1423093.

It is an arithmetic number, because the mean of its divisors is an integer number (5765561856).

Almost surely, 2^51221323210 is an apocalyptic number.

51221323210 is a deficient number, since it is larger than the sum of its proper divisors (41027666486).

51221323210 is a wasteful number, since it uses less digits than its factorization.

51221323210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811557.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 51221323210 its reverse (1232312215), we get a palindrome (52453635425).

The spelling of 51221323210 in words is "fifty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred ten".