51444076221 has 24 divisors (see below), whose sum is σ = 78228933120. Its totient is φ = 32486895936.

The previous prime is 51444076217. The next prime is 51444076249. The reversal of 51444076221 is 12267044415.

It is not a de Polignac number, because 51444076221 - 2² = 51444076217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51444076421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1914340 + ... + 1941026.

It is an arithmetic number, because the mean of its divisors is an integer number (3259538880).

Almost surely, 2^51444076221 is an apocalyptic number.

It is an amenable number.

51444076221 is a deficient number, since it is larger than the sum of its proper divisors (26784856899).

51444076221 is a wasteful number, since it uses less digits than its factorization.

51444076221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37985 (or 37982 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 51444076221 in words is "fifty-one billion, four hundred forty-four million, seventy-six thousand, two hundred twenty-one".