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20997211 is a prime number
BaseRepresentation
bin101000000011…
…0010001011011
31110111202202111
41100012101123
520333402321
62030013151
7343321234
oct120062133
943452674
1020997211
1110941574
1270471b7
1344722b1
142b0808b
151c9b5e1
hex140645b

20997211 has 2 divisors, whose sum is σ = 20997212. Its totient is φ = 20997210.

The previous prime is 20997187. The next prime is 20997217. The reversal of 20997211 is 11279902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20997211 - 213 = 20989019 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20997217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498605 + 10498606.

It is an arithmetic number, because the mean of its divisors is an integer number (10498606).

Almost surely, 220997211 is an apocalyptic number.

20997211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20997211 is an equidigital number, since it uses as much as digits as its factorization.

20997211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 20997211 is about 4582.2713800036. The cubic root of 20997211 is about 275.8802033838.

The spelling of 20997211 in words is "twenty million, nine hundred ninety-seven thousand, two hundred eleven".