221243051 has 2 divisors, whose sum is σ = 221243052. Its totient is φ = 221243050.

The previous prime is 221243023. The next prime is 221243069. The reversal of 221243051 is 150342122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221243051 - 2¹⁴ = 221226667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221243021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110621525 + 110621526.

It is an arithmetic number, because the mean of its divisors is an integer number (110621526).

Almost surely, 2^221243051 is an apocalyptic number.

221243051 is a deficient number, since it is larger than the sum of its proper divisors (1).

221243051 is an equidigital number, since it uses as much as digits as its factorization.

221243051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221243051 is about 14874.2411907297. The cubic root of 221243051 is about 604.8159183143.

Adding to 221243051 its reverse (150342122), we get a palindrome (371585173).

The spelling of 221243051 in words is "two hundred twenty-one million, two hundred forty-three thousand, fifty-one".