51134121021 has 4 divisors (see below), whose sum is σ = 68178828032. Its totient is φ = 34089414012.

The previous prime is 51134121011. The next prime is 51134121023. The reversal of 51134121021 is 12012143115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51134121021 - 2¹⁰ = 51134119997 is a prime.

It is a super-2 number, since 2×51134121021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51134121023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8522353501 + ... + 8522353506.

It is an arithmetic number, because the mean of its divisors is an integer number (17044707008).

Almost surely, 2^51134121021 is an apocalyptic number.

It is an amenable number.

51134121021 is a deficient number, since it is larger than the sum of its proper divisors (17044707011).

51134121021 is a wasteful number, since it uses less digits than its factorization.

51134121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17044707010.

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

Adding to 51134121021 its reverse (12012143115), we get a palindrome (63146264136).

The spelling of 51134121021 in words is "fifty-one billion, one hundred thirty-four million, one hundred twenty-one thousand, twenty-one".