221431357445455 has 8 divisors (see below), whose sum is σ = 265722331990752. Its totient is φ = 177141950585568.

The previous prime is 221431357445437. The next prime is 221431357445483. The reversal of 221431357445455 is 554544753134122.

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 221431357445455 - 2⁷ = 221431357445327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221431357445396 and 221431357445405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391610584 + ... + 392175613.

It is an arithmetic number, because the mean of its divisors is an integer number (33215291498844).

Almost surely, 2^{221431357445455} is an apocalyptic number.

221431357445455 is a deficient number, since it is larger than the sum of its proper divisors (44290974545297).

221431357445455 is an equidigital number, since it uses as much as digits as its factorization.

221431357445455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783842705.

The product of its digits is 40320000, while the sum is 55.

The spelling of 221431357445455 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, three hundred fifty-seven million, four hundred forty-five thousand, four hundred fifty-five".