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211121983 is a prime number
BaseRepresentation
bin11001001010101…
…11011100111111
3112201021002220201
430211113130333
5413021400413
632541024331
75142335662
oct1445273477
9481232821
10211121983
11a919a086
125a8550a7
133497c767
14200796d9
15138049dd
hexc95773f

211121983 has 2 divisors, whose sum is σ = 211121984. Its totient is φ = 211121982.

The previous prime is 211121971. The next prime is 211121987. The reversal of 211121983 is 389121112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-211121983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560991 + 105560992.

It is an arithmetic number, because the mean of its divisors is an integer number (105560992).

Almost surely, 2211121983 is an apocalyptic number.

211121983 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121983 is an equidigital number, since it uses as much as digits as its factorization.

211121983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 28.

The square root of 211121983 is about 14530.0372676742. The cubic root of 211121983 is about 595.4488837775.

The spelling of 211121983 in words is "two hundred eleven million, one hundred twenty-one thousand, nine hundred eighty-three".