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21145001 is a prime number
BaseRepresentation
bin101000010101…
…0010110101001
31110210021111012
41100222112221
520403120001
62033113305
7344505143
oct120522651
943707435
1021145001
1110a32609
1270b8835
1344c4647
142b45c93
151cca2bb
hex142a5a9

21145001 has 2 divisors, whose sum is σ = 21145002. Its totient is φ = 21145000.

The previous prime is 21144989. The next prime is 21145049. The reversal of 21145001 is 10054112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 30976 = 4595^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 21145001 - 210 = 21143977 is a prime.

It is a super-2 number, since 2×211450012 = 894222134580002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21145051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572500 + 10572501.

It is an arithmetic number, because the mean of its divisors is an integer number (10572501).

Almost surely, 221145001 is an apocalyptic number.

It is an amenable number.

21145001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145001 is an equidigital number, since it uses as much as digits as its factorization.

21145001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21145001 is about 4598.3693849016. The cubic root of 21145001 is about 276.5259565769.

Adding to 21145001 its reverse (10054112), we get a palindrome (31199113).

The spelling of 21145001 in words is "twenty-one million, one hundred forty-five thousand, one".