2051226221 has 4 divisors (see below), whose sum is σ = 2237701344. Its totient is φ = 1864751100.

The previous prime is 2051226179. The next prime is 2051226241. The reversal of 2051226221 is 1226221502.

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 a cyclic number.

It is not a de Polignac number, because 2051226221 - 2³⁰ = 977484397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051226241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93237545 + ... + 93237566.

It is an arithmetic number, because the mean of its divisors is an integer number (559425336).

Almost surely, 2^2051226221 is an apocalyptic number.

It is an amenable number.

2051226221 is a deficient number, since it is larger than the sum of its proper divisors (186475123).

2051226221 is a wasteful number, since it uses less digits than its factorization.

2051226221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186475122.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2051226221 is about 45290.4650119647. The cubic root of 2051226221 is about 1270.5873285220.

Adding to 2051226221 its reverse (1226221502), we get a palindrome (3277447723).

The spelling of 2051226221 in words is "two billion, fifty-one million, two hundred twenty-six thousand, two hundred twenty-one".