51021420007 has 8 divisors (see below), whose sum is σ = 53737312896. Its totient is φ = 48346991352.

The previous prime is 51021420001. The next prime is 51021420041. The reversal of 51021420007 is 70002412015.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51021420007 - 2¹¹ = 51021417959 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 51021420007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021420001) 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, 10363533 + ... + 10368454.

It is an arithmetic number, because the mean of its divisors is an integer number (6717164112).

Almost surely, 2^51021420007 is an apocalyptic number.

51021420007 is a deficient number, since it is larger than the sum of its proper divisors (2715892889).

51021420007 is a wasteful number, since it uses less digits than its factorization.

51021420007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20732117.

The product of its (nonzero) digits is 560, while the sum is 22.

The spelling of 51021420007 in words is "fifty-one billion, twenty-one million, four hundred twenty thousand, seven".