1220421439 has 2 divisors, whose sum is σ = 1220421440. Its totient is φ = 1220421438.

The previous prime is 1220421437. The next prime is 1220421451. The reversal of 1220421439 is 9341240221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220421439 - 2¹ = 1220421437 is a prime.

Together with 1220421437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220421437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610210719 + 610210720.

It is an arithmetic number, because the mean of its divisors is an integer number (610210720).

Almost surely, 2^1220421439 is an apocalyptic number.

1220421439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220421439 is an equidigital number, since it uses as much as digits as its factorization.

1220421439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1220421439 is about 34934.5307539689. The cubic root of 1220421439 is about 1068.6527542630.

The spelling of 1220421439 in words is "one billion, two hundred twenty million, four hundred twenty-one thousand, four hundred thirty-nine".