51221051211 has 8 divisors (see below), whose sum is σ = 74503347264. Its totient is φ = 31043061320.

The previous prime is 51221051159. The next prime is 51221051239. The reversal of 51221051211 is 11215012215.

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

It is a cyclic number.

It is not a de Polignac number, because 51221051211 - 2³¹ = 49073567563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51221051281) 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, 776076501 + ... + 776076566.

It is an arithmetic number, because the mean of its divisors is an integer number (9312918408).

Almost surely, 2^51221051211 is an apocalyptic number.

51221051211 is a deficient number, since it is larger than the sum of its proper divisors (23282296053).

51221051211 is a wasteful number, since it uses less digits than its factorization.

51221051211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552153081.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 51221051211 its reverse (11215012215), we get a palindrome (62436063426).

The spelling of 51221051211 in words is "fifty-one billion, two hundred twenty-one million, fifty-one thousand, two hundred eleven".