221552408861 has 8 divisors (see below), whose sum is σ = 253551043200. Its totient is φ = 189640847088.

The previous prime is 221552408851. The next prime is 221552408887. The reversal of 221552408861 is 168804255122.

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

It is not a de Polignac number, because 221552408861 - 2⁶ = 221552408797 is a prime.

It is a super-2 number, since 2×221552408861² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221552408851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21762686 + ... + 21772863.

It is an arithmetic number, because the mean of its divisors is an integer number (31693880400).

Almost surely, 2^221552408861 is an apocalyptic number.

It is an amenable number.

221552408861 is a deficient number, since it is larger than the sum of its proper divisors (31998634339).

221552408861 is an equidigital number, since it uses as much as digits as its factorization.

221552408861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43536283.

The product of its (nonzero) digits is 307200, while the sum is 44.

The spelling of 221552408861 in words is "two hundred twenty-one billion, five hundred fifty-two million, four hundred eight thousand, eight hundred sixty-one".