402444024421 has 4 divisors (see below), whose sum is σ = 402592366252. Its totient is φ = 402295682592.

The previous prime is 402444024413. The next prime is 402444024427. The reversal of 402444024421 is 124420444204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 392057561025 + 10386463396 = 626145^2 + 101914^2 .

It is a cyclic number.

It is not a de Polignac number, because 402444024421 - 2³ = 402444024413 is a prime.

It is a super-2 number, since 2×402444024421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402444024427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74166846 + ... + 74172271.

It is an arithmetic number, because the mean of its divisors is an integer number (100648091563).

Almost surely, 2^402444024421 is an apocalyptic number.

It is an amenable number.

402444024421 is a deficient number, since it is larger than the sum of its proper divisors (148341831).

402444024421 is a wasteful number, since it uses less digits than its factorization.

402444024421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148341830.

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

Adding to 402444024421 its reverse (124420444204), we get a palindrome (526864468625).

The spelling of 402444024421 in words is "four hundred two billion, four hundred forty-four million, twenty-four thousand, four hundred twenty-one".