404217347621 has 2 divisors, whose sum is σ = 404217347622. Its totient is φ = 404217347620.

The previous prime is 404217347603. The next prime is 404217347683. The reversal of 404217347621 is 126743712404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399820994596 + 4396353025 = 632314^2 + 66305^2 .

It is a cyclic number.

It is not a de Polignac number, because 404217347621 - 2⁶ = 404217347557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404217347021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202108673810 + 202108673811.

It is an arithmetic number, because the mean of its divisors is an integer number (202108673811).

Almost surely, 2^404217347621 is an apocalyptic number.

It is an amenable number.

404217347621 is a deficient number, since it is larger than the sum of its proper divisors (1).

404217347621 is an equidigital number, since it uses as much as digits as its factorization.

404217347621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 404217347621 in words is "four hundred four billion, two hundred seventeen million, three hundred forty-seven thousand, six hundred twenty-one".