221025487 has 2 divisors, whose sum is σ = 221025488. Its totient is φ = 221025486.

The previous prime is 221025473. The next prime is 221025569. The reversal of 221025487 is 784520122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221025487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221025887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110512743 + 110512744.

It is an arithmetic number, because the mean of its divisors is an integer number (110512744).

Almost surely, 2^221025487 is an apocalyptic number.

221025487 is a deficient number, since it is larger than the sum of its proper divisors (1).

221025487 is an equidigital number, since it uses as much as digits as its factorization.

221025487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 221025487 is about 14866.9259431800. The cubic root of 221025487 is about 604.6176004823.

The spelling of 221025487 in words is "two hundred twenty-one million, twenty-five thousand, four hundred eighty-seven".