221242039 has 2 divisors, whose sum is σ = 221242040. Its totient is φ = 221242038.

The previous prime is 221242003. The next prime is 221242051. The reversal of 221242039 is 930242122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221242039 - 2¹³ = 221233847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221242139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110621019 + 110621020.

It is an arithmetic number, because the mean of its divisors is an integer number (110621020).

Almost surely, 2^221242039 is an apocalyptic number.

221242039 is a deficient number, since it is larger than the sum of its proper divisors (1).

221242039 is an equidigital number, since it uses as much as digits as its factorization.

221242039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 221242039 is about 14874.2071721487. The cubic root of 221242039 is about 604.8149961390.

The spelling of 221242039 in words is "two hundred twenty-one million, two hundred forty-two thousand, thirty-nine".