221496823909 has 4 divisors (see below), whose sum is σ = 221500035904. Its totient is φ = 221493611916.

The previous prime is 221496823883. The next prime is 221496823937. The reversal of 221496823909 is 909328694122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221496823909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221496823909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221496823949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500237 + ... + 1641250.

It is an arithmetic number, because the mean of its divisors is an integer number (55375008976).

Almost surely, 2^221496823909 is an apocalyptic number.

It is an amenable number.

221496823909 is a deficient number, since it is larger than the sum of its proper divisors (3211995).

221496823909 is an equidigital number, since it uses as much as digits as its factorization.

221496823909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211994.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 221496823909 in words is "two hundred twenty-one billion, four hundred ninety-six million, eight hundred twenty-three thousand, nine hundred nine".