51113554221 has 8 divisors (see below), whose sum is σ = 68185712224. Its totient is φ = 34058549520.

The previous prime is 51113554213. The next prime is 51113554231. The reversal of 51113554221 is 12245531115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51113554221 - 2³ = 51113554213 is a prime.

It is a super-2 number, since 2×51113554221² (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 (51113554231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281370 + ... + 4293291.

It is an arithmetic number, because the mean of its divisors is an integer number (8523214028).

Almost surely, 2^51113554221 is an apocalyptic number.

It is an amenable number.

51113554221 is a deficient number, since it is larger than the sum of its proper divisors (17072158003).

51113554221 is a wasteful number, since it uses less digits than its factorization.

51113554221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8576651.

The product of its digits is 6000, while the sum is 30.

The spelling of 51113554221 in words is "fifty-one billion, one hundred thirteen million, five hundred fifty-four thousand, two hundred twenty-one".