51421442220 has 120 divisors (see below), whose sum is σ = 166873568400. Its totient is φ = 13239531648.

The previous prime is 51421442203. The next prime is 51421442227. The reversal of 51421442220 is 2224412415.

It is a happy number.

51421442220 is a `hidden beast` number, since 5 + 1 + 4 + 214 + 422 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51421442227) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 500290 + ... + 594249.

It is an arithmetic number, because the mean of its divisors is an integer number (1390613070).

Almost surely, 2^51421442220 is an apocalyptic number.

It is an amenable number.

51421442220 is an abundant number, since it is smaller than the sum of its proper divisors (115452126180).

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

51421442220 is a wasteful number, since it uses less digits than its factorization.

51421442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094589 (or 1094578 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 51421442220 its reverse (2224412415), we get a palindrome (53645854635).

The spelling of 51421442220 in words is "fifty-one billion, four hundred twenty-one million, four hundred forty-two thousand, two hundred twenty".