402144444221 has 8 divisors (see below), whose sum is σ = 433084861440. Its totient is φ = 371204916912.

The previous prime is 402144444187. The next prime is 402144444241. The reversal of 402144444221 is 122444441204.

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 402144444221 - 2¹⁴ = 402144427837 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 (402144444241) 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, 941756 + ... + 1300458.

It is an arithmetic number, because the mean of its divisors is an integer number (54135607680).

Almost surely, 2^402144444221 is an apocalyptic number.

It is an amenable number.

402144444221 is a deficient number, since it is larger than the sum of its proper divisors (30940417219).

402144444221 is a wasteful number, since it uses less digits than its factorization.

402144444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444955.

The product of its (nonzero) digits is 32768, while the sum is 32.

Adding to 402144444221 its reverse (122444441204), we get a palindrome (524588885425).

The spelling of 402144444221 in words is "four hundred two billion, one hundred forty-four million, four hundred forty-four thousand, two hundred twenty-one".