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203031021 = 367677007
BaseRepresentation
bin11000001101000…
…00000111101101
3112011001001012110
430012200013231
5403433443041
632051354233
75013510114
oct1406400755
9464031173
10203031021
11a4673236
1257bb2979
13330a8acb
141cd70c7b
1512c57516
hexc1a01ed

203031021 has 4 divisors (see below), whose sum is σ = 270708032. Its totient is φ = 135354012.

The previous prime is 203031011. The next prime is 203031067. The reversal of 203031021 is 120130302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 203031021 - 26 = 203030957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 203030988 and 203031006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203031011) 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, 33838501 + ... + 33838506.

It is an arithmetic number, because the mean of its divisors is an integer number (67677008).

Almost surely, 2203031021 is an apocalyptic number.

It is an amenable number.

203031021 is a deficient number, since it is larger than the sum of its proper divisors (67677011).

203031021 is an equidigital number, since it uses as much as digits as its factorization.

203031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67677010.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 203031021 is about 14248.8954308746. The cubic root of 203031021 is about 587.7430010909.

Adding to 203031021 its reverse (120130302), we get a palindrome (323161323).

The spelling of 203031021 in words is "two hundred three million, thirty-one thousand, twenty-one".

Divisors: 1 3 67677007 203031021