221302399987 has 2 divisors, whose sum is σ = 221302399988. Its totient is φ = 221302399986.

The previous prime is 221302399979. The next prime is 221302400021. The reversal of 221302399987 is 789993203122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221302399987 - 2³ = 221302399979 is a prime.

It is a super-2 number, since 2×221302399987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221302399937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110651199993 + 110651199994.

It is an arithmetic number, because the mean of its divisors is an integer number (110651199994).

Almost surely, 2^221302399987 is an apocalyptic number.

221302399987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221302399987 is an equidigital number, since it uses as much as digits as its factorization.

221302399987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 221302399987 in words is "two hundred twenty-one billion, three hundred two million, three hundred ninety-nine thousand, nine hundred eighty-seven".