51921108 has 48 divisors (see below), whose sum is σ = 135898560. Its totient is φ = 17141472.

The previous prime is 51921083. The next prime is 51921109. The reversal of 51921108 is 80112915.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51921109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9310 + ... + 13802.

It is an arithmetic number, because the mean of its divisors is an integer number (2831220).

Almost surely, 2^51921108 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51921108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67949280).

51921108 is an abundant number, since it is smaller than the sum of its proper divisors (83977452).

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

51921108 is a wasteful number, since it uses less digits than its factorization.

51921108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613 (or 4605 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 51921108 is about 7205.6302985929. The cubic root of 51921108 is about 373.0622603534.

The spelling of 51921108 in words is "fifty-one million, nine hundred twenty-one thousand, one hundred eight".