5651322121 has 4 divisors (see below), whose sum is σ = 5983752852. Its totient is φ = 5318891392.

The previous prime is 5651322109. The next prime is 5651322137. The reversal of 5651322121 is 1212231565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3713561721 + 1937760400 = 60939^2 + 44020^2 .

It is a cyclic number.

It is not a de Polignac number, because 5651322121 - 2¹⁹ = 5650797833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5651322121.

It is not an unprimeable number, because it can be changed into a prime (5651322151) 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 3 ways as a sum of consecutive naturals, for example, 166215340 + ... + 166215373.

It is an arithmetic number, because the mean of its divisors is an integer number (1495938213).

Almost surely, 2^5651322121 is an apocalyptic number.

It is an amenable number.

5651322121 is a deficient number, since it is larger than the sum of its proper divisors (332430731).

5651322121 is a wasteful number, since it uses less digits than its factorization.

5651322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332430730.

The product of its digits is 3600, while the sum is 28.

The square root of 5651322121 is about 75175.2759955027. The cubic root of 5651322121 is about 1781.2164097394.

Adding to 5651322121 its reverse (1212231565), we get a palindrome (6863553686).

The spelling of 5651322121 in words is "five billion, six hundred fifty-one million, three hundred twenty-two thousand, one hundred twenty-one".