203421429 has 16 divisors (see below), whose sum is σ = 317227200. Its totient is φ = 128476368.

The previous prime is 203421401. The next prime is 203421431. The reversal of 203421429 is 924124302.

It is not a de Polignac number, because 203421429 - 2¹³ = 203413237 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203421529) 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 15 ways as a sum of consecutive naturals, for example, 197754 + ... + 198779.

It is an arithmetic number, because the mean of its divisors is an integer number (19826700).

Almost surely, 2^203421429 is an apocalyptic number.

It is an amenable number.

203421429 is a deficient number, since it is larger than the sum of its proper divisors (113805771).

203421429 is a wasteful number, since it uses less digits than its factorization.

203421429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396561 (or 396555 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 203421429 is about 14262.5884396907. The cubic root of 203421429 is about 588.1194832159.

The spelling of 203421429 in words is "two hundred three million, four hundred twenty-one thousand, four hundred twenty-nine".