202404431421 has 24 divisors (see below), whose sum is σ = 307715428384. Its totient is φ = 132922302480.

The previous prime is 202404431399. The next prime is 202404431423. The reversal of 202404431421 is 124134404202.

202404431421 is a `hidden beast` number, since 202 + 4 + 0 + 4 + 4 + 31 + 421 = 666.

202404431421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 202404431421 - 2⁵ = 202404431389 is a prime.

It is a super-3 number, since 3×202404431421³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202404431423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6199690 + ... + 6232251.

Almost surely, 2^202404431421 is an apocalyptic number.

It is an amenable number.

202404431421 is a deficient number, since it is larger than the sum of its proper divisors (105310996963).

202404431421 is an equidigital number, since it uses as much as digits as its factorization.

202404431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12432023 (or 12432011 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 202404431421 its reverse (124134404202), we get a palindrome (326538835623).

The spelling of 202404431421 in words is "two hundred two billion, four hundred four million, four hundred thirty-one thousand, four hundred twenty-one".