402424404421 has 8 divisors (see below), whose sum is σ = 436288721400. Its totient is φ = 368975600832.

The previous prime is 402424404401. The next prime is 402424404427. The reversal of 402424404421 is 124404424204.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1844273025 + 400580131396 = 42945^2 + 632914^2 .

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 402424404421 - 2¹³ = 402424396229 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 (402424404427) 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, 103876330 + ... + 103880203.

It is an arithmetic number, because the mean of its divisors is an integer number (54536090175).

Almost surely, 2^402424404421 is an apocalyptic number.

It is an amenable number.

402424404421 is a deficient number, since it is larger than the sum of its proper divisors (33864316979).

402424404421 is a wasteful number, since it uses less digits than its factorization.

402424404421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207756695.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 402424404421 its reverse (124404424204), we get a palindrome (526828828625).

The spelling of 402424404421 in words is "four hundred two billion, four hundred twenty-four million, four hundred four thousand, four hundred twenty-one".