51101001021 has 16 divisors (see below), whose sum is σ = 77904835200. Its totient is φ = 29186830848.

The previous prime is 51101000989. The next prime is 51101001037. The reversal of 51101001021 is 12010010115.

It is not a de Polignac number, because 51101001021 - 2⁵ = 51101000989 is a prime.

It is a super-2 number, since 2×51101001021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51101000988 and 51101001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51101001521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526776 + ... + 616193.

It is an arithmetic number, because the mean of its divisors is an integer number (4869052200).

Almost surely, 2^51101001021 is an apocalyptic number.

It is an amenable number.

51101001021 is a deficient number, since it is larger than the sum of its proper divisors (26803834179).

51101001021 is a wasteful number, since it uses less digits than its factorization.

51101001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145108.

The product of its (nonzero) digits is 10, while the sum is 12.

Adding to 51101001021 its reverse (12010010115), we get a palindrome (63111011136).

The spelling of 51101001021 in words is "fifty-one billion, one hundred one million, one thousand, twenty-one".