402440200421 has 8 divisors (see below), whose sum is σ = 460107426240. Its totient is φ = 344816916768.

The previous prime is 402440200417. The next prime is 402440200433. The reversal of 402440200421 is 124002044204.

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 402440200421 - 2² = 402440200417 is a prime.

It is a super-2 number, since 2×402440200421² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440200121) 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, 10965911 + ... + 11002548.

It is an arithmetic number, because the mean of its divisors is an integer number (57513428280).

Almost surely, 2^402440200421 is an apocalyptic number.

It is an amenable number.

402440200421 is a deficient number, since it is larger than the sum of its proper divisors (57667225819).

402440200421 is a wasteful number, since it uses less digits than its factorization.

402440200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21971083.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 402440200421 its reverse (124002044204), we get a palindrome (526442244625).

The spelling of 402440200421 in words is "four hundred two billion, four hundred forty million, two hundred thousand, four hundred twenty-one".