51021121602 has 96 divisors (see below), whose sum is σ = 114544817856. Its totient is φ = 15135690240.

The previous prime is 51021121601. The next prime is 51021121603. The reversal of 51021121602 is 20612112015.

It is an interprime number because it is at equal distance from previous prime (51021121601) and next prime (51021121603).

It is a super-4 number, since 4×51021121602⁴ (a number of 44 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (51021121601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7257213 + ... + 7264239.

It is an arithmetic number, because the mean of its divisors is an integer number (1193175186).

Almost surely, 2^51021121602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51021121602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57272408928).

51021121602 is an abundant number, since it is smaller than the sum of its proper divisors (63523696254).

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

51021121602 is a wasteful number, since it uses less digits than its factorization.

51021121602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7264 (or 7253 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 51021121602 its reverse (20612112015), we get a palindrome (71633233617).

It can be divided in two parts, 510 and 21121602, that added together give a palindrome (21122112).

The spelling of 51021121602 in words is "fifty-one billion, twenty-one million, one hundred twenty-one thousand, six hundred two".