221155232413 has 8 divisors (see below), whose sum is σ = 228807675000. Its totient is φ = 213504549888.

The previous prime is 221155232407. The next prime is 221155232449. The reversal of 221155232413 is 314232551122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61681199449 + 159474032964 = 248357^2 + 399342^2 .

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 221155232413 - 2⁹ = 221155231901 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 (221155232713) 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, 181788 + ... + 689461.

It is an arithmetic number, because the mean of its divisors is an integer number (28600959375).

Almost surely, 2^221155232413 is an apocalyptic number.

It is an amenable number.

221155232413 is a deficient number, since it is larger than the sum of its proper divisors (7652442587).

221155232413 is an equidigital number, since it uses as much as digits as its factorization.

221155232413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880031.

The product of its digits is 14400, while the sum is 31.

Adding to 221155232413 its reverse (314232551122), we get a palindrome (535387783535).

It can be divided in two parts, 2211 and 55232413, that added together give a square (55234624 = 7432²).

The spelling of 221155232413 in words is "two hundred twenty-one billion, one hundred fifty-five million, two hundred thirty-two thousand, four hundred thirteen".