51067845921 has 32 divisors (see below), whose sum is σ = 71700185088. Its totient is φ = 32268075840.

The previous prime is 51067845919. The next prime is 51067845923. The reversal of 51067845921 is 12954876015.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51067845919) and next prime (51067845923).

It is not a de Polignac number, because 51067845921 - 2¹ = 51067845919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51067845923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7979895 + ... + 7986291.

It is an arithmetic number, because the mean of its divisors is an integer number (2240630784).

Almost surely, 2^51067845921 is an apocalyptic number.

It is an amenable number.

51067845921 is a deficient number, since it is larger than the sum of its proper divisors (20632339167).

51067845921 is a wasteful number, since it uses less digits than its factorization.

51067845921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461.

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 51067845921 in words is "fifty-one billion, sixty-seven million, eight hundred forty-five thousand, nine hundred twenty-one".