221309292909 has 16 divisors (see below), whose sum is σ = 298669597632. Its totient is φ = 145744679808.

The previous prime is 221309292901. The next prime is 221309292913. The reversal of 221309292909 is 909292903122.

It is not a de Polignac number, because 221309292909 - 2³ = 221309292901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221309292901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2256987 + ... + 2352999.

It is an arithmetic number, because the mean of its divisors is an integer number (18666849852).

Almost surely, 2^221309292909 is an apocalyptic number.

It is an amenable number.

221309292909 is a deficient number, since it is larger than the sum of its proper divisors (77360304723).

221309292909 is an equidigital number, since it uses as much as digits as its factorization.

221309292909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105356.

The product of its (nonzero) digits is 314928, while the sum is 48.

The spelling of 221309292909 in words is "two hundred twenty-one billion, three hundred nine million, two hundred ninety-two thousand, nine hundred nine".