221709953479 has 8 divisors (see below), whose sum is σ = 253387268480. Its totient is φ = 190033754616.

The previous prime is 221709953449. The next prime is 221709953501. The reversal of 221709953479 is 974359907122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221709953479 - 2²¹ = 221707856327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221709953449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201892 + ... + 695830.

It is an arithmetic number, because the mean of its divisors is an integer number (31673408560).

Almost surely, 2^221709953479 is an apocalyptic number.

221709953479 is a deficient number, since it is larger than the sum of its proper divisors (31677315001).

221709953479 is an equidigital number, since it uses as much as digits as its factorization.

221709953479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558069.

The product of its (nonzero) digits is 8573040, while the sum is 58.

The spelling of 221709953479 in words is "two hundred twenty-one billion, seven hundred nine million, nine hundred fifty-three thousand, four hundred seventy-nine".