2221121051 has 2 divisors, whose sum is σ = 2221121052. Its totient is φ = 2221121050.

The previous prime is 2221120999. The next prime is 2221121053. The reversal of 2221121051 is 1501211222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2221121051 - 2⁶ = 2221120987 is a prime.

Together with 2221121053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2221121053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110560525 + 1110560526.

It is an arithmetic number, because the mean of its divisors is an integer number (1110560526).

Almost surely, 2^2221121051 is an apocalyptic number.

2221121051 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221121051 is an equidigital number, since it uses as much as digits as its factorization.

2221121051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2221121051 is about 47128.7709472674. The cubic root of 2221121051 is about 1304.7402977974.

Adding to 2221121051 its reverse (1501211222), we get a palindrome (3722332273).

The spelling of 2221121051 in words is "two billion, two hundred twenty-one million, one hundred twenty-one thousand, fifty-one".