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20211001 is a prime number
BaseRepresentation
bin100110100011…
…0010100111001
31102000211021121
41031012110321
520133223001
62001105241
7333535126
oct115062471
942024247
1020211001
1110454908
126928221
134258495
14298174d
151b936a1
hex1346539

20211001 has 2 divisors, whose sum is σ = 20211002. Its totient is φ = 20211000.

The previous prime is 20210963. The next prime is 20211007. The reversal of 20211001 is 10011202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19053225 + 1157776 = 4365^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211001 - 217 = 20079929 is a prime.

It is a super-2 number, since 2×202110012 = 816969122844002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20211007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105500 + 10105501.

It is an arithmetic number, because the mean of its divisors is an integer number (10105501).

Almost surely, 220211001 is an apocalyptic number.

It is an amenable number.

20211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211001 is an equidigital number, since it uses as much as digits as its factorization.

20211001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20211001 is about 4495.6646894536. The cubic root of 20211001 is about 272.3929989798.

Adding to 20211001 its reverse (10011202), we get a palindrome (30222203).

The spelling of 20211001 in words is "twenty million, two hundred eleven thousand, one".