51216102 has 48 divisors (see below), whose sum is σ = 127325952. Its totient is φ = 14574960.

The previous prime is 51216091. The next prime is 51216119. The reversal of 51216102 is 20161215.

51216102 is a `hidden beast` number, since 51 + 2 + 1 + 610 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38533 + ... + 39839.

It is an arithmetic number, because the mean of its divisors is an integer number (2652624).

Almost surely, 2^51216102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51216102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63662976).

51216102 is an abundant number, since it is smaller than the sum of its proper divisors (76109850).

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

51216102 is a wasteful number, since it uses less digits than its factorization.

51216102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51216102 is about 7156.5426010050. The cubic root of 51216102 is about 371.3660291004.

Adding to 51216102 its reverse (20161215), we get a palindrome (71377317).

It can be divided in two parts, 51 and 216102, that added together give a triangular number (216153 = T₆₅₇).

The spelling of 51216102 in words is "fifty-one million, two hundred sixteen thousand, one hundred two".