403665213221 has 8 divisors (see below), whose sum is σ = 416817765888. Its totient is φ = 390520854000.

The previous prime is 403665213187. The next prime is 403665213227. The reversal of 403665213221 is 122312566304.

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 403665213221 - 2⁶ = 403665213157 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 (403665213227) 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, 1948145 + ... + 2145366.

It is an arithmetic number, because the mean of its divisors is an integer number (52102220736).

Almost surely, 2^403665213221 is an apocalyptic number.

It is an amenable number.

403665213221 is a deficient number, since it is larger than the sum of its proper divisors (13152552667).

403665213221 is a wasteful number, since it uses less digits than its factorization.

403665213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096723.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 403665213221 its reverse (122312566304), we get a palindrome (525977779525).

The spelling of 403665213221 in words is "four hundred three billion, six hundred sixty-five million, two hundred thirteen thousand, two hundred twenty-one".