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21001033 is a prime number
BaseRepresentation
bin101000000011…
…1001101001001
31110111222000001
41100013031021
520334013113
62030043001
7343335334
oct120071511
943458001
1021001033
1110944429
127049461
134473c61
142b0961b
151c9c7dd
hex1407349

21001033 has 2 divisors, whose sum is σ = 21001034. Its totient is φ = 21001032.

The previous prime is 21001021. The next prime is 21001037. The reversal of 21001033 is 33010012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 4460544 = 4067^2 + 2112^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21001033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500516 + 10500517.

It is an arithmetic number, because the mean of its divisors is an integer number (10500517).

Almost surely, 221001033 is an apocalyptic number.

It is an amenable number.

21001033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001033 is an equidigital number, since it uses as much as digits as its factorization.

21001033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21001033 is about 4582.6884031101. The cubic root of 21001033 is about 275.8969413237.

Adding to 21001033 its reverse (33010012), we get a palindrome (54011045).

The spelling of 21001033 in words is "twenty-one million, one thousand, thirty-three".