51221381270487 has 8 divisors (see below), whose sum is σ = 69960911003760. Its totient is φ = 33314719525440.

The previous prime is 51221381270459. The next prime is 51221381270503. The reversal of 51221381270487 is 78407218312215.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51221381270487 - 2¹⁹ = 51221380746199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221381270447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208216996912 + ... + 208216997157.

It is an arithmetic number, because the mean of its divisors is an integer number (8745113875470).

Almost surely, 2^{51221381270487} is an apocalyptic number.

51221381270487 is a deficient number, since it is larger than the sum of its proper divisors (18739529733273).

51221381270487 is a wasteful number, since it uses less digits than its factorization.

51221381270487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416433994113.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The spelling of 51221381270487 in words is "fifty-one trillion, two hundred twenty-one billion, three hundred eighty-one million, two hundred seventy thousand, four hundred eighty-seven".